I am wanting to build a very small NFT system. I have 8 foot of 6inch PVC. I only want to grow 3 plants. If yall dont mind me asking, which pump would you buy and where would you get it?

We recommend a 550 GPH pump.  You can purchase this pump from Hydroponics Unlimited, https://hydroponicsunlimited.com/product/AAPW550.html.