I just got a free catalog from a company called FarmTek. It has a lot of greenhouse supplies and hydroponics products for sale. On page 147 it's got some great NFT channels listed - if I only had the bucks! They've got an 800 number and a website 1(800)327-6835 http://www.FarmTek.com - As soon ad I get their OK, I will list them in the FAQ for suppliers.