I've been browsing online trying to find some decent 5v power supplies and found
these.
They are the Logisys power supplies, they offer 30A-40A depending on the power supply, you'll notice from the model numbers they only really offer a couple power supplies, they just change the fans/color between them.
The PS480D2 offers 5v@36A
The PS480D offers 5v@36A
The only difference I can see between these is that the D2 has 2 80mm fans instead of 1, I'm guessing this is because the PS480D isn't cooled well enough and fails prematurely. Of the two I'd get the PS480D.
The PS480E12 is the same 5v@36A power supply but with 1 120mm fan instead of 2 80mm fans, according to most reviews the 80mm fans found in the PS480D/PS480D2's are noisey, so this would probably be the better option if you are worried about noise.
The PS550A offers 5v@38A
The PS550E12 is the same 5v38A but with 1x 120mm fan instead of 2x 80mm again.
The PS575X offers 5v@40A, this is the highest amperage offered that I've found in these cheap power supplies, one can either get this or a $26 5v 40a switching power supply from ebay that only does 5v, I think this is the best deal out there for 40A at 5v, plus you don't have to snip up a bunch of wires to get it to work with the 49 port USB hub.
I ended up going with the PS55E12 as noise is an issue for me, I got it on amazon with prime shipping (
Hover Hound will compare prices on newegg to amazon and tiger direct, handy for searching on newegg/buying on amazon)