I didn't want to be the one to bring this up, but since the cat is out of the bag; what going rate for a 1/4 oz?
Depends. As little as $5, or as much as $50. Depends on your negotiating ability, and who and where you're getting it. I usually get a QP, and pay around $50 for that, which is still a tourist price, locals can get a pound for $50.