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I like LiveAquaria, although it is kind of expensive. Aquabid is good, but is really depends on the seller. Your best bet is probably LiveAquaria if you are willing to pay the extra money. I haven't tried anything but these two so I can't really tell you much more. Good Luck!
You could PM Severum Mama or HN1 here on this site - they sell very quality FW livestock, and if they don't have what you are looking for, can get it 9 times out of 10.
Aquabid is a great source.
LiveAquaria is very reputable but expensive.
You can always post in the classifieds section here as well - there are lots of hobbyists on the site that breed and sell high quality stock.
Another option would be to ask your LFS to order them for you and be there at delivery time to pick up your order. This way the fish never go into the LFS tanks, but you should still have a quarantine routine of your own. I do this most of the time and the LFS owner gives me the fish at cost as he does not have to do anything with them.