Packs of certain products for a reduced price.
Pills, coke, weed, lsd, etc. Worldwide delivery is a must.
Edit: Seen as though this has made it to the top of DNM I'll add some more info.
Should be enough to last at least 3 days and nights, would ideally contain a benzo of some sort to aid comedowns and hangovers.
(Also maybe different style packs, like autismhour has stated, they would be interested in a pack that is stimulant heavy, others may want a psychedelic pack, others may just want a selection of smokes)
I imagine these would be fairly popular.
EDIT 2 Wow, not one vendor reply.
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