X indicates I have a pdf version (but not be the best)

d20
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XXX Black Snake Dawn (got it) (2006)
XXX Murder at the Vulgar Unicorn (got it) (2005)
XXX Shadowspawn's Guide to Sanctuary (got it) (2005)
XXX Thieves' World Gazatteer (got it) (2006
XXX Thieves' World Player's Manual (got it) (2005)

Thieves' World RPG Gift Set (2006 Box)

Generic
The Blue Camel (FASA 1982)
Dark Assassin (FASA 1984)
XXX Rober L Asprin's Thieves' World (1991 I have 2 versions + extras)
The Spirit Stones (FASA (1983)
Traitor (FASA 1982)

MERP / RuneQuest
XXX Thieves' World Companion (MERP 1/RuneQuest 3 1986) (got it)