#1. Freres de Bataille (FDB): sells at SCG but are always negociating if you buy a lot (and they have pretty much anything with 5-6+ copies of each in stock). They trade for store credit. You can also sell your cards in their displays but they keep 25% if you want the $ and keep 10% if you take credit instead of cash. P.S. Yuppers, that's the store I helped 2 years ago (sold them staples at tcg low, brought them 25 new customers and at least 10 of them are now weekly regulars, introduced tournaments to the store, designed their displays and my father buit them, etc...)
#2. Multizone: sells at SCG + 10% (yeah...), they pretty much have none to 2 copies of their overpriced good cards and 10+ copies of their crappy overpriced cards. Tournament prizes blows, won't sell your cards because it nullifies the stock they have for sell (LOWER YOUR PRICES!) :P
Also, FDB gives back 100% of the $ accumulated for entry fees into store credit/boosters/fatpacks/etc... so they don't make A LOT of profit, BUT, they get customers to spread the word and bring back more new players/customers.