This is my attempt to collect all the (legally) available samples of Tolkien’s scripts. In particular the Website of the Tolkien Estate is a treasure trove for this, their presentation of the material is quite nicely done and also includes much of Tolkien’s other art.

Tengwar

• DTS 1 – The Lonely Mountain Jar Inscription → Ill. #10, https://www.tolkienestate.com/painting/the-hobbit/
• DTS 2 – The Jacket Ring-inscription → Ill. #14, https://www.tolkienestate.com/painting/the-lord-of-the-rings/
• DTS 3 – Elendil’s Monogram → Ill. #1, 2, https://tolkienlibrary.com/tolkien-book-store/nh0013.php
• DTS 5 – The Lord of the Rings Title-page Tengwar (Corrected) → https://www.sothebys.com/en/auctions/ecatalogue/2002/literature-and-illustration-l02303/lot.785.html (Actually → DTS 59)
• DTS 13 – Middle Page from the Book of Mazarbul → Ill. #5, https://www.tolkienestate.com/painting/the-lord-of-the-rings/
• DTS 14 – Last Page from the Book of Mazarbul, Last Line → Ill. #6, https://www.tolkienestate.com/painting/the-lord-of-the-rings/
• DTS 16 – Elvish Script Sample I → Ill. #2, https://www.tolkienestate.com/painting/calligraphy/
• DTS 18 – Elvish Script Sample III → Ill. #3, https://www.tolkienestate.com/painting/calligraphy/
• DTS 19 – The Jacket Namárie → https://tolkiengateway.net/wiki/The_Road_Goes_Ever_On_(book)
• DTS 24 – The Treebeard Page → scroll down to the galery, Ill. #2, https://www.bnf.fr/fr/agenda/tolkien-voyage-en-terre-du-milieu
• DTS 26 – Televised Tengwar → video #3, https://www.tolkienestate.com/audio-visual/visual/
• DTS 29 – The Doors of Durin (Draft A) → p. 14, https://www.researchgate.net/publication/33441320_The_Invented_Worlds_of_JRR_Tolkien_Drawings_and_Original_Manuscripts_from_the_Marquette_University_Collection
• DTS 34 – The Two Towers Jacket (draft C) → Ill. #15, https://www.tolkienestate.com/painting/the-lord-of-the-rings/
• DTS 38 – The Return of the King Jacket (draft) → Ill. #16, https://www.tolkienestate.com/painting/the-lord-of-the-rings/
• DTS 39 – Doodled Headlines → Ill. 42, https://www.tolkienestate.com/painting/imagination/
• DTS 43 – Lúthien's Maian Device Title → Ill. 10, https://www.tolkienestate.com/painting/the-silmarillion/
• DTS 45 – King's Letter, second version → https://tolkiengateway.net/wiki/File:Vinyar_Tengwar_29.jpg
• DTS 47 – The d'Ardenne Dedication → Ill. #8, https://www.jrrvf.com/fervent-hommage/tolkien-en-1-image/
• DTS 49 – King's Letter, Third Version → Ill. # 8, https://www.tolkienestate.com/painting/calligraphy/
• ??DTS 53 – Ring-Inscription Draft → p. 15, https://www.researchgate.net/publication/33441320_The_Invented_Worlds_of_JRR_Tolkien_Drawings_and_Original_Manuscripts_from_the_Marquette_University_Collection
• DTS 56 – Tengwar Autograph → https://dc.swosu.edu/mythlore/vol21/iss2/45/, p. 308, Fig. 6
• DTS 58 – The Howlett Rivendell Inscriptions → https://www.sothebys.com/en/auctions/ecatalogue/2001/valuable-printed-books-and-manuscripts-l01321/lot.557.html
• DTS 59 – The Ridley Dedication → https://www.sothebys.com/en/auctions/ecatalogue/2002/literature-and-illustration-l02303/lot.785.html
• DTS 64 – Calma Hendas → Ill. #4, https://www.theguardian.com/books/2018/mar/24/unpublished-art-by-lord-of-the-rings-creator-jrr-tolkien-goes-on-show (This is not identical to the version published in Life and Legend, item #168 that DTS references, but rather the Parma Mittarion - Calma Hendas cover, hat tip to Zionius for pointing that out).
• DTS 68 – The White signature → https://web.archive.org/web/20080610161919/http://www.williams.edu/philosophy/faculty/awhite/Enigma%20Library/Tolkien%20letter%2010%20quality.jpg
• DTS 69 – Rejected ring-inscription → Ill. #1, https://www.tolkienestate.com/painting/the-lord-of-the-rings/
• DTS 70 – "Tolkien in Oxford Tengwar" → https://www.christies.com/lot/lot-4808634
• DTS 84 – The Cowling Dedication → https://web.archive.org/web/20120411100458/https://bayeastauctions.com.au/lot_details.php?lot=177950&image=2
• DTS 89 – Cotton Minchin "Cirith" → Ill. #2, https://tolkienlibrary.com/press/1142-tolkien-letter-to-cotton-minchin-regarding-publication-of-the-lord-of-the-rings.php
• DTS 91 – Hepworth Greeting → Ill. #3, https://www.christies.com/lot/lot-6218450
• DTS 97 – The Keane and Kirke letter → p. 8-9, https://www.christies.com/lot/lot-6389717
• DTS-Add. 1 – Ambaróna → Ill. #9, https://www.tolkienestate.com/painting/the-silmarillion/
• DTS-Add. 2 – Aldarion → Ill. #3, https://www.tolkienestate.com/painting/#calligraphy (This has been orriginally published in Maker of Middle-earth, which contains two other Tengwar samples missing from DTS)
• ??DTS-Add. 3 – Elvish Fire Writing → Ill. 4, https://tolkien.bodleian.ox.ac.uk/about-the-exhibition/
• DTS-Add. 4 – Signed copy of the Hobbit → https://tolkienlibrary.com/tolkien-book-store/clp0869.php

Cirth

• DCS 2 – The Lord of the Rings Title-page Cirth (Corrected) → https://www.sothebys.com/en/auctions/ecatalogue/2002/literature-and-illustration-l02303/lot.785.html (Actually → DTS 59)
• DCS 6 – Balin's Tomb-inscription → Ill. #7, https://www.tolkienestate.com/painting/calligraphy/
• DCS 11 – Top Page from the Book of Mazarbul → Ill. #4, https://www.tolkienestate.com/painting/calligraphy/
• DCS 12 – Middle Page from the Book of Mazarbul → Ill. #5, https://www.tolkienestate.com/painting/calligraphy/
• DCS 13 – Last Page from the Book of Mazarbul → Ill. #6, https://www.tolkienestate.com/painting/calligraphy/

Rúmilian

• R 1a – Túrin Prose Fragment → Ill. #1, https://www.tolkienestate.com/painting/calligraphy/

Valmaric

• DTS 27 – Lunar Landscape title → Ill. #19, https://www.tolkienestate.com/painting/for-children/

Runes of the Hobbit

• Thrór’s map → Ill. #4, https://www.tolkienestate.com/painting/maps/
• On the runes used in The Hobbit → https://www.christies.com/lot/lot-6389717