This is an online craft store great for handbag-making supplies, - http://tallpoppycraft.com/
Though they are located in Australia, they do have a New York office, and even with increase shipping fees, you're unlikely to find some of their supplies any cheaper here, if you order in bulk. (Bamboo and leather handles, magnetic snaps, rings, etc.)
Shipping was extremely quick - had the items in under a week, and that was through regular mail.
Definitely recommend them if you're in the market for purse-making supplies.