Fans I buy off of Amazon, I found they are cheapest. I ordered and ACME threaded rod from McMaster-Carr. They cost a few bucks, but they are not a bad deal. As for a hot bed, they can charge quite a bit of money, but I have pondered making one our of aluminium plating. Maybe not cut it myself. but there are plenty of places that will do it for you. Other parts I have purchased have been stabilizer rods, pulleys and belts from Amazon, which are cheap. In fact Amazon has bearings, both round and linear and I just looked and found that they have a 214mm x 214mm hot bed for $10.50 and a few bucks for shipping. Anyway, I hope that helps and good luck on your build. Please let me know how it goes.
