The Cyberoam SCB-6901 could be an alternative to the SW302DA, using intel 211 NICs.
Only drawback are the USB2 ports, where as the 302 got USB3s.
Was $20 + S&H on ebay.com (I bought it), still cheapish on ebay.co.uk, if you're in EU, and don't mind the import fees.
Look for the CR25ing version (or CR25Wing, if you want wifi). There's also the CR15ing/CR15Wing and CR35ing.
