i pick up off the street all the time, not very hard!

find a mc donalds/tacobell/kfc, some low end fast food chain, and find the teenagest looking cashier(you know the one or two cashiers that have a life outside"want fries with that?").just calmly ask "ive got an unusual question, you knwo where i could get some green/tree/pot/chronic?"(but only one of them)

chances are, they will have, or someone in the store will have some. make sure they can do a dub sac or 2gish, and come back at break time or something, however they wanna do it.

i suggest you do this later at night, because this shoudl only really be done when no ones in line.