I'm not sure how many tablets in a box. I have never purchased it. Even when it was in the open on the shelves. Don't have allergies and never cooked meth. The $100 is for using one's valid ID and going to the store to buy it. I think it's something like $14.00 a box and you pay with the $100 and get to keep the change. Not sure because I haven't done it. Just what my damn nosy ears hear. Plus I was asked one time and declined. I didn't want my ID on a database and the clientele wasn't the most trustworthy, if you know what I mean. No offense to any user ever but it made me uncomfortable.