I understand your problem, and I kinda share it:
1 can't buy online cause you can't afford for it to come in the mail,
2 you can't really find a rare Ab dl store.

I'm naturally paranoid, so I go out to a convenient store or walmart a couple of miles away, sure it's gas money, but at least I'm confident that I won't see anyone I know.

As for the cashier, 9 times out of 10 they won't really care. Last new years I bought some new pacifiers and a new bottle and the woman was too busy talking to care. Just avoid small talk.

I no that it's not quality ab stuff, but a diaper is a diaper and as long as I can hide it and it will hold a wetting, I could careless

or the last and final option, you muster up the courage and tell your folks. But for most people that doesnt work. so go to your local pharmacy or supermarket and buy the diapers and supplies. thats what I do, and my parent knows, its cheaper, you know what your getting and you can get it under 20 dollars.

I live a few hours from my parents for college, though I live with a dorm mate I still go out and buy at a local Walgreens. If you buy other stuff as well and then ask them to ring up the diapers separately they may think that you are buying for someone else paying with their money instead of your own.

Never heard of one, but not sure I'd use it if there were. I get embarassed going into a vanilla sex shop. I'd probably faint.