Best bet for AVR cooling costs $20.
Amazon.com: AC Infinity MULTIFAN S7, Quiet Dual 120mm USB Fan, UL-Certified for Receiver DVR Playstation Xbox Computer Cabinet Cooling: Computers & Accessories
www.amazon.com
Those aren't bad, I actually purchased a pair more than a year ago for non audio function. I like that they use usb to be powered rather than your standard molex or 3/4pin connectors.
However, as I mentioned in my post, I think cooler guys is phenomenal. They have pretty fair prices and offer much more air flow than all of those units. Also I doubt the CFM/air flow is much different between the AC infinity and those.
Those fans would be far more efficient with a case or some kind of enclosure which need to be built, which is a hassle if youre not handy or have the tools for DIY project.
My last reason for purchasing the cooler guys is you can swap out any fans into the cooler guys mount, and if you choose Noctua, those are the industry leading fans. Nothing can cool better than noctua's, they have insane static pressure and CFM. The top of the line version only costs 27 dollars, and yes that is only for a single fan. But that single fan has 3x the air flow of 1 of those ac infinity or 1 and 1/2 times+ of two of them. That's the reason I went with cooler guys, they provide you with everything you need to add any fans. Unit failure is impossible since you can interchange the fans very easily. Not sure how the AC infinity T line, I believe it is T line costs 119, functions and if the unit dies it's basically warranty or trash. It only has 3 fans and therefore regardless you are getting much more static pressure and CFM with 4 fans the cooler guys use vs 3 of the ac infinity. Unless you go with noctua's.
Otherwise everything is exactly the same, besides the fancy tech design AC infinity has.