I highly recommend WeedTRACKER.com The list on CaNORML can sometimes be a bit dated, and short

I was in a similar position as you, most of the co-ops are in LA and I'm a bit of a drive from there, but I found a decent one closer. It's nice because you can read reviews, get an idea of prices, and just in general find out where a good place is to go. I already have a place picked out for my next trip, it's in LA which is far but from what I've read it's worth the drive :stoned: