So it's holiday seaon over here, not posting anything new for the next few days (I'm playing NBA and Tomb Raider).
But I am compiling a list of HUNDREDS of press and internal asset discs, such as these:
I have several folders, this is the first of 5 (TBH, the good stuff - Jak, RC, MGS and others are already gone). Won't sell any alone, only as package deals. a disc would be in the 10-20$ range, depending on contents before discount.

This Is what I listed so far:
1. Hi res artwork december 2003 – disc 3 – sony
2. Hi res artwork december 2003 – disc 2 – sony
3. Hi res artwork december 2003 – disc 1 – sony
4. Bloody roar 4 / bloody war extreme artwork - konami – 19.9.03
5. Suikoden 4 skteches and screens – konami – 24.10.03
6. Cy Girls artwork, screenshorts, renders – konami – 24.10.03
7. Yu-Gi-Oh! Power of chaos Milleium Edition, Packshot – konami – 24.10.03
8. Galdiator Artwork – acclaim
9. Dog’s Life Video footage – sony
10. Karaoke – Working logo, screens – Konami -5.8.03
11. Hi res artwork October 2003 – sony - disc 1
12. Hi res artwork October 2003 – sony - disc 2
13. Hi res artwork August 2003 – sony - disc 1
14. Hi res artwork August 2003 – sony - disc 2
15. Hi res artwork August 2003 – sony - disc 3
16. Hi res artwork August 2003 – sony - disc 4
17. Hi res artwork August 2003 – sony - disc 5
18. Hi res artwork August 2003 – sony - disc 6
19. Hi res artwork April 2004 – sony
20. SCPH Playstation 2 images – sony – disc 1 July 2003
21. Monthly artwork disc 3 – sony – august 2003
22. Monthly artwork disc 2 – sony – august 2003
23. Monthly artwork disc 3 – sony – October 2003
24. Monthly artwork disc 3 – sony – July 2003
25. Monthly artwork disc 2 – sony – July 2003
26. Monthly artwork disc 1 – sony – July 2003
27. Monthly artwork disc 3 – sony – September 2003
28. Monthly artwork disc 2 – sony – September 2003
29. Monthly artwork disc 1 – sony – September 2003
30. The Red Star artwork – acclaim
31. Monthly artwork disc 1 – sony – December 2003
32. NBA Jam artwork – Acclaim
33. Best of platinum stickers – Sony – Stricly for SCEE use only
34. Hi res artwork June 2004 – sony - disc 1
35. Hi res artwork June 2004 – sony - disc 2
36. Hi res artwork June 2004 – sony - disc 3
37. Monthly artwork disc 3 – sony – June 2004
38. Monthly artwork disc 2 – sony – June 2004
39. Monthly artwork disc 1 – sony – June 2004
40. Monthly artwork disc 2 – sony – April 2004
41. Monthly artwork disc 1 – sony – February 2005
42. Knights of the Temply Infernal Crusade Digital PK – TDK Interactive – 10.2003
43. PS2 / PSP software showcase February 2005 version 2
44. Athens 2004 Announcement Asset kit – sony - “Embargo until further notice”
45. Monthly artwork disc 3 – sony – July 2002
46. R&C PK press disc
47. Singstar PK press disc
48. Disney’s Lilo and stitch Trouble in Paradise + Stitch Experiment 626 press information – sony – Summer 2002
49. ICO PK press disc
50. Eyetoy PK press disc
51. GT Tokyo Geneva CD video Demo (PK?)
52. MCfarelaine’s Evil Prophecy screens – Konami – 18.6.2004
53. Enthusia logo – Konami – 18.6.2004
54. YGO Poer of Chaos Joey the Passion logo and packshot – Konami – 16.6.04
55. Firefighter F.D 18 Artwork – Konami – 27.11.03
56. Firefighter F.D 18 1/1 layered Konami – 22.3.2004
57. Firefighter F.D 18 Characters, screens – Konami – 20.11.03
58. WWX Rumble Rose trailer No Music – Konami – 1.3.04
59. Yu-Gi-Oh! Power of chaos – Kaiba The Revenge advert layerrd – Konami – 1.3.04
60. Monthly artwork disc 1 – sony – April 2004
61. Monthly artwork disc 2 – sony – April 2004
62. 100 bullets – artwork – acclaim
63. Bards Tale – artwork - acclaim
64. Ace Combat 5 (working title) / Death by Degress announcement assets – sony – april 2004
65. Deadly skies 3 movie – Konami – 7.5.2004
66. Combat Elite WWII Praratroopers press disc – Acclaim
67. Monthly artwork disc 5 – Rez, Vampire Night, Space Channel 5 – sony – December 2001
68. Monthly artwork disc 3 – Ace Combat 4, Headhunter, Parappa 2 0 sony – December 2001
69. Monthly artwork disc 6 – Motogp 2, Wipeout Fusion - sony – December 2001
70. Showdown Legends of Wrestling press disc – acclaim