You can try:
http://www.geckoranch.com/leopard.html I have heard nothing but good about them. I don't know if you want to have a gecko shipped to you or not (which is not too harmful; that's how I receive all my reptiles), but you could just go to
www.google.com and type in "leopard gecko breeder" or go to
http://market.kingsnake.com/index.php?cat=10 and if you find a gecko you particularily like, go to
www.faunaclassifieds.com and register, then post in the Original Board of Inquiry (BOI) about the seller of that gecko (do this BEFORE you buy it!!) so you can know if this dealer is known to be a good guy or bad guy.
Good luck, there are TONS of leo breeders out there, just have to find one you like.
Jennifer