Office depot sells some mesh chairs made by raynor. The in-store price on the quantum is $249 atm. I just got one, really nice chair.
http://www.officedepot.com/a/products/510830/Realspace-PRO-Quantum-60percent-Recycled-Mesh/...
There is a performance hit with the coolant you are using compared to water. Not sure how much. There might be some other problems with pc ice.
http://reviews.pcapex.com/cooling/primochill_pc_ice_coolant.php
http://www.forumapex.com/extreme_cooling/65857-primochill_ice_problem.html
Yeah, it is safe. I have 3/8" ID Tygon r-3603 stretched over 1/2" OD barbs and also 1/2" ID stretched over 5/8" OD barbs. No need to heat the tubing up, I just forced it on there. Been running without hose clamps this way for over 3 years.
http://www.mcmaster.com has several flow-control tube clamps in plastic or metal on page 152 of their catalog. I made my own out of scrap materials I already had laying around. I used some 1/4" aluminum rod and some 8-32 nylon screws to make mine.
You can see it in lower left.