I'd probably spend it all in one place to get the best deal, either LSD or another cheap psych, maybe DOx. Any one of my favorites that's also inexpensive. $500 of heroin, while it sounds great, would make a junkie out of me again pretty quickly. Also:
Why would you even do dope if it's costing you that much? Unless it's coming straight from the poppy field that seems like a waste of money.
1/2g of heroin-$220.
