@EOD: i've bought from a few places like that here and there, but when it comes to elusives you might have to go overseas. but there's this online store:
http://exoticplantsplus.com/
i cannot highly recommend this store enough. this guy sells pretty rare plants, and plus he hardens them for you so there's no danger of your plant going into shock due to low humidity levels or such (within reason of course), i've received pests from other nurseries, but this guy is clean! superb plants!
all the other stores that paul mentioned sell good plants as well, but your best bet at finding rare plants will be from connections gained from forums.
@saram521: drosera can be found here:
http://homerscarnivorousgarden.t35.com/plants_for_sale.html
http://www.petflytrap.com/Categories.bok?category=Plants:Carnivorous:Sundews (Drosera)
a lot of these plants, including the VFT are considered to be very difficult to grow, however, that's only because people dont know what perimeters to grow their plants in. once when you've established the basics for each genus, and even species---you will find them to be very robust plants. however i do recommend that you start with the more novice friendly plants--basically the home depot plants (but dont buy them from home depot unless they're fresh out of the box! your chances in keeping your plants alive are inversely proportional to how long they've sat on the shelf)
species/hybrids that come to mind:
for sundews start with : Drosera capensis, D. spatulata, D. adelae
for neps start with: N. ventricosa, N. sanguinea, N. truncata, or any Nep hybrid
for heliamphora start with: H. heterodoxa x minor
for pings: Pinguicula moranensis
for sarrs: Sarracenia purpurea