With the impending announcement of the PS4 looming over the entire industry and a price cut coming to the PS Vita soon its fitting that Best Buy has decided to slash prices on PS2/PSP pre-owned games.
Most pre-owned PS2 and PSP games are only $1 in store only right now. There are some exceptions but it seems like 90% of both consoles libraries have been reduced to $1.
Remember this is in-store only, so no online ordering. Finding a Best Buy near you that has a lot of used PS2/PSP games might be challenge, but you never know.