Cool tubes are glass. Unless you happen to have a glass cylinder laying around I don't think it's possible. Duct fans from Lowes should be fine, I'd get metal over plastic blades IMO.
Lowes duct booster fans are a piece of shit. Don't even go for that. A cool tube on eBay is like 60 bucks a proper inline fan and filter combo is like 180? We'll worth the investment. Ull get it back within the first grow if you got a good enough light.
I've seen home made cooltubes on here. theres a user named "jigfresh" who uses them in a vertical setup in a closet. it looks like they are some kind of vase or something that he found.
I'll bet A.C. Moore or Micheal's crafts would have something you could use.