I forgot to ask - what do you mean by "cheap"?
If I was looking for a cheap reservoir I'd go to usplastics.com. get a nalgene square (or rectangular, depending on where I was trying to fit it) bottle (note - not round - you want flat sides to drill) and some of the nylon barbed hose fittings that not only are threaded but come with a nut.
I'd then just drill a couple of holes the right size, push the fittings through (gooped with something - I'd use teflon paste, but other stuff would work), put the nuts on the back side and tighten things down a bit. Avoid the right-angle fittings if you can.
Should be under $10, not counting the drill bit and whatever goop you use.
You could also just buy something used. Given that the bayres, innovatek push-on, and danger den reservoirs are under $30 new, it's probably not worth it to someone to try selling one for, say, $15 - but you might post a "WTB" and bring a couple "out of the woodwork"
Bob
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