Most places i kmow of are going to be expensive. I belive if you become or are a KCBS member (dont know the costs, if any) you can get a day pass to restaurant depot.
Chester's smokehouse is more of a specialty store. Love that place. Not sure if they will sell you a brisket tho.
There's Henry's meat market on Rt 32 in Waterford.
Rt 66 meats in wynantskill, well, on Rt 66..:biggrin:
I get some stuff from hilltown smokehouse on Rt 20 in New Lebenon, However, he's pricey, but only 5 min from me...