Old Street Fighter games are hard to find nowadays it seems to me.
Luckily I kept hold of mine.
Anyway, I've got the following hard to find games.
Pilot Wings (SNES)
Street Fighter Alpha (PSX)
Street Fighter Alpha 2 Dash (PSX)
Street Fighter Alpha 3 (PSX)
Street Fighter Collection 2 (PSX)
Pocket Fighter (PSX)
Super Street Fighter 2 Turbo : Revival (GBA)
Final Fantasy VII (PC)