carnivorousplants.org has seeds. It's a 30 dollar membership to get access to their seed bank but after that you get seeds packs for 3-6 dollars.
My membership expired but while I had it there were always plenty of droseras, sarracenias, and venus flytraps. Occasionally they'd have pinguicula and nepenthes available. They are wonderful and I've had a lot of seeds grow into beautiful plants from them.
They also have great forums and guides for growing carnivorous plants.
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