Personally I'd be wary, if they are keen & their business is sound then no reason why they souldn't just buy stock from you.......
so check them out VERY thoroughly (ask their other suppliers if they pay up, can be trusted) & be VERY professional in that you provide & get them to sign an invoice when you deliver the goods, & let them know you have copyrighted the goods (photos in a sealed envelope posted to yourself or a friend used to suffice) etc etc
IME, this too often means.....
you give us the stock for free, & we still expect to add a huge mark up, often the same as if we bought the stock from you, & if you are lucky & we are generally doing well sales wise, we'll pay you when the goods are sold...& then we'll just copy them & make out own, as we make more profit
....& .if we are not doing well, then your stuff might just get nicked/lost & we wont pay you as its not our fault 
Sorry, I'm sure its not what you want to hear, but I've years of experience in this sort of thing & I wont touch Sale or return with a barge pole now, very few that ask for it are honest traders....in my experience at least 
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