Q:

Compact mATX case for NAS system with four 3.5" drives

I'm looking for a compact mATX case for a NAS system. One that I can stick in a corner somewhere and forget about (figuratively).
I have done some research into this, but all results I found that were less than 50 USD only had three or fewer drive bays. I found a few mATX cases with four 3.5" bays, but they were out of my budget range.
Necessary Requirements:

Four bays for 3.5" HDDs
Front Panel USB 2.0
Less than $50 USD (lower is better, new not used)
Approx. 3 inches of clearance for the CPU fan (~76mm)

Optional, but would be nice:

Cube/LAN box style
Dust Filters
From Amazon.com

Any suggestions?
Thanks!

A:

I cannot find a cube style but the following did come across as a good option.
SilverStone PS08B @ Newegg 39.99
SilverStone PS08B @ Amazon(prime eligible) 39.99
Just posted the Newegg link along with the Amazon link, due to the fact that Newegg is much better with item specifications....and power searches...than Amazon is.
Just a few specs on the case:
2 x USB 3.0 / Audio Front Ports
Side Air duct
2 External 5.25" Drive Bays
4 Internal 3.5" Drive Bays 

