I, in my business, mainly sell wholesale and my "day job" is as a buyer for a childrens furniture and home decor boutique. So I kinda know a bit about this subject. Therefore I have a question: What do you mean by, discount? Are you asking how vendors (you) should price their products?
It depends on what you want for it, what you need to get for it, what you're time is worth. Boutiques will mark up items anywhere from x2.0 (called: Keystone) to x2.5 (truthfully, thay can mark items up however they want); it depends on location and clientele and shop owners prerogaitve. So if you are asking $13 for an item, understand that the shop is going to try and get anywhere from $26-$32 for it, respectively. A lot of the time, boutiques take into consideration the higher wholesale prices for "cottage industry" merchandise and choose to only keystone the product. Now concerning minimum orders: at the least you should have a minimum opening order, and it should be whatever makes this transaction worth your while, $100, $150, $250? Whether or not you want to have a minimum re-order is again your call; it can be of a lesser amount if you like, $50-$100. Again, it's all about doing what is worth your time and effort. Do you have a line sheet? I'm going to pretend like you don't and that you don't know what one is (so if you do, my apologies, skip this part). When a shop inquires about wholesale info, you should send or leave if you're there in person, a line sheet with all pertinent information and some photo's or drawings of the products. A good start would be, company name and contact info, product descriptions, prices, terms (leadtime, how you accept payment, minimums, shipping/handling fee's, "prices and availability are subject to change blah, blah, blah"), you get the picture.
Now one other thing to take into consideration. If you currently sell your products directly to customers you need to consider this when pricing for wholesale. If you sell an item to the public for $13, it would stand to reason that your wholesale price could be $6.50. Now if that is unthinkable, if you must get $13, you might want to consider raising your prices to the public, say to $26. Then your wholesale price could be $13. You don't want to be under-cutting your wholesale accounts.
Hope I've helped and not confused the situation.
all the best to you.
p.s. line sheets don't have to be fancy. nice computer print outs or color xerox's are great.