I'm not joking - I went to a pawn store today and these were their actual prices. They priced all games by their console (so for example, each DS game was the same price regardless of condition or completeness).

3DS - $6 each
DS - $6 each
Atari 2600 - $4 each
PSP - $5 each
PS2 - $2 each
NES - $2 each
SNES - $2 each

And for the record, they had no NES nor SNES games at the time.