i don't think i would aim to connect the customers with the growers directly because as you said the technology doesn't exist to do it smoothly (especially at a low budget) But i was thinking of it more as customers uniting like a groupon type system so we share buying power and stop getting screwed paying retail. I would shop the idea to one of the bigger name dispensaries so trust wouldn't be an issue and it would keep it simple with one retailer or maybe a few competing ones giving deals out like groupon.