Plastic pots are the easiest. I suggest getting ones that are straight and tall, not tapered, because they hold more media, and hence more water, which means that the hydration of the soil will change more slowly and give your plants more consistent conditions. (Which means less watering and easier care for you.) Darlingtonia like to grow horizontally and can take shallow containers - they'll spread out and make runners as adults. VFTs can take shallower pots in warm conditions, but they don't like to be totally waterlogged in cold and dark winter weather. Or at least, that's my experience with growing in the Pacific NW climate - I use pots about eight inches deep now and have since ceased having wintertime VFT problems. I like rectangular pots because they fit together neatly, which minimizes evaporation from water trays and also protects temperate plants from quick freezes.
The best place to get pots is the hardware store dumpster, or landscaping projects. Pots from the garden store are overpriced and pretty - your pots are going to be spattered with peat and algae so a nice plain black pot will look as good or better than some flowery fake stonework job from Rite-Aid. (Not to mention, a smooth, plain black plastic pot is easier to wipe down than ceramic or textured plastic.) Nursery pots are what you want - the mass-produced plain black UV-resistant plastic ones. You can find them online in bulk for reasonable prices - a case of 800 little nursery pots costs about as much as a dozen big plain terra cotta pots at Home Depot. But you can also find them discarded at places that have lots of nursery plants.
For your Nepenthes, you might try using a net pot, like they sell for pond plants, but for your first try I suggest getting a really big one. I put all my adult Neps in net pots that are about ten inches square and seven or eight inches tall. And that's probably the minimum size you should use - I only recently found a source for bigger ones and I'm immediately thinking about which plants I should move up first. I like to do this so that I can leave my plants sitting in a little water. That way they don't dry out as fast, and I don't have to worry as much about overwatering either. In a normal pot, the media might get too waterlogged for most Neps if you left them in water; Neps need airflow to their roots. The net pots let air in through the sides, so you can give constant water through the bottom (but still let the tray dry out between watering.) With net pots, you need to use a sizeable proportion of media that won't compress - stuff like orchid bark, big chunks of perlite, ceramic chips or horticultural charcoal. LFS and peat will compact and decay over time unless they're mixed in with chunky stuff to allow air in. Plants like Sarracenia and VFTs don't mind that at all, but Neps have different expectations.
I need to go sign papers on a new apartment, but I can't resist the urge to help... best luck!
PS - I made several threads about shopping around for T5s recently... use the search feature at the top of the page and look for threads started by me. They're all in the terrarium subforum, IIRC.