A) It is in the Commons Building underground (which is conveniently attached underground, so you don't even have to go outside
B) 2 years ago it was $1.25 (I think) to wash and the same to dry, so about $2.50 per load assuming you don't need multiple machines
C) Yes you need your own detergent (buy it from Wal Mart or grocery store, they are pretty cheap and last whole year)
D) I think they provide a garbage bin, but if not they are all around or you can improvise