Just get a cheaper res, or make one yourself. I'm going to be using just a $15 res. Tupperware container maybe?
My first 2 attempts at water cooling reservoirs did not go well. My first setup ever, was using a Swiftec BayRes. Remember those? Yah, proclamied a Godsend when they came out, a bit later were known for splitting all around the seam. Killed my 6800Extreme.
Next attempt was with a "higher quality" bay res, those ones that fill up 3 5-1/4" drives? Yah, the glue didn't bond around the front corners, and I developed a very prolonged drip, that ruined my PC-65 by letting the Zerex eat the anodized coating. Hooray.
I've run a T-line for 2 years since, but they look bad IMHO, and take forever to bleed with a full-tower case that you can't shake about the way you can with a mid sized one.
I do A LOT of LANs, I want something that will last. Tupperware and disposable containers, not so appealing to this thought. Besides, if I make one out of acrylic, I have to worry about jointing and if the seams are perfect and the glue bonded correctly with no gaps, over-use, under-use, and the glue having bubbles in it otherwise I get a res that splits open and kills my rather not cheap hardware. That makes for a very destructive panda.
I would rather pay $45 to have a very respected company in the field of water cooling and block making, take a cast tube, threaded and fit to a CNC delrin top and bottom, with pre-tapped holes and high-flow barbs. Add fluid, turn rig on, and be set as the system purges itself. And its very much this easy with the Swifty QR rads, as they have a bleed screw.
Sorry for the long drug-out explanation, but I can't see myself trusting something either cheaper by an unknown company or one that would involve mixing other metals into my loop, or making something that would possibly fail and damage/destroy yet another rig because I took the cheap way out.
It is good to know though that the stuff only seems to affect the much mroe porous tubing and not the cast plastics. Certainly a plus.