[Khledar]

I made a res. out of acrylic sheet quite easily, and it looks pretty good. I cut 6 pieces out of a big sheet of acrylic, drilled two holes in one of the sides, tapped(threaded) the holes, glued the 6 sheets together, screwed in hose barbs and presto - done.

Total Cost(CAD):
Acrylic: 5-10
3/8" NPT Tap: 13
Acrylic Solvent: 8
Barbs: 5
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~$35CAD = 25-30 USD

And that's including the tap(for making the threads) and the glue - the cost of the tiny amount of glue I used is probably 10 cents, and I've used the $13 tap for 15-20 holes so ~1.30 for the tap usage and you're looking at 10USD for materials and a couple more bucks for tools if you use them for a couple projects.


[EDIT: I excluded tools I assume everyone has like a 37/64 drill bit a hacksaw, and some sandpaper for making sure those edges are super-square]