Chicagoland here:
At flea markets? Great. Almost anywhere else? Forget about it.
God I would kill to find ONE decent sega saturn or dreamcast game a month, or any at all for that matter.
Garage sales are generally good though so I cannot wait for summer.
This is all provided I get up early enough though. By 8AM or so all the flea markets are picked over, so yeah, there's a ton of competition in my neck of the woods.
Is it better or worse in California?