In NYC, I've paid $50 for 2g baggies of some great quality stuff (delivery services) A bit steep, but there's something priceless about being able to just text a number and have a guy show up at your door 30 mins later. Also, my understanding is the 'higher ups' get $40 of that and the runners get $10.
I also have a guy who slings 1g bags for $20- SUPERB quality. It's a trek to get to him tho, so I guess that's the trade off.
In SC, I pay $60 for an 1/8 for some great stuff. However, right now I'm trying to get a 1/4, but dude wants to charge $120. I know I should get a break on a bigger bag tho, so that blows.
www.priceofweed.com has an index of prices across the country compiled by user-submissions; organized by location (state), price/quanity, and quality.