It's up to you if you want to sell em, just make sure the guy knows they aren't sexed. The only time I've bought plants I paid $5 each for clones plus shipping so that's a good deal to me especially since they're only seedlings.

I recommend a tent or plywood box with the inside painted flat white as well, but with the added security and environmental control you have to worry more about heat and ventilation so it's a give and take thing.