theres no tar on the east coast... its all powder all the time... you can still get it by the gram but they are usually a little more, but like everything its all about location...
anyways a bag (aka fold, stamp) are usually .1 and go for about ten bags n folds are mostly just plain bags or pieces of paper to used to hold the shit and stamps are the glassine baggies that are "branded" (gucci, LVs, skull candy, ect ect ect...literally goes on forever)... a bundle is usually just called a bun and is ten bags and a brick is five buns or 50 bags...