Normally wholesale is 50% of retail. I'd be really surprised if a retailer is expecting to pay only 10%! They will be looking at your retail prices and be expecting to pay 50% or up to 70% if this is on consignment.
Generally speaking it works something like this... You need to cost the whole thing out from your supply costs: paper, ink, packaging; to time spent ordering supplies, time spent on design, time spent printing, cutting, packaging.
Cost to make x 2 + profit = wholesale price
wholesale price x 2 = retail price
Based on that, your prints should not be costing you more than $2.50 at most to make. If they are, and you want to sell wholesale, then you need to revisit your production costs and your prices.
Good luck. :)