First and foremost just know that anybody selling louis vuitton is probably selling replicas. It is soooo hard to get authentic louis.
Fendi, Prada and gucci, todd, marc jacobs are not hard to get. Coach can be found at the outlets. Fendi outlet can even ship your order to you. If you do find someone selling the authentic ones the profit margin is not worth the headache. Concentrate on fendi and Prada.
If you must get Louis, you can get in touch with maltastockhouse.com they are in Italy and can buy from the catalogue. Be prepared to spend no less than 10-15k. queenbeeofbeverlyhills.com is also a good wholesaler but the profit margin is so slim.