CalDigit makes a lot of this kind of stuff and it's supposed to be good quality. You can buy from Powermax.
That said, I just returned a USB3/eSATA card of theirs because I found out that the USB ports will not function with non-storage devices (keyboard, etc.). It wasn't defective and if they had just specified this in the data sheet we both could have been save a lot of troubleshooting (I'd never have purchased it to start with). Fortunately, they guarantee satisfaction, so I'll get my money back.
So, if you want USB3, and don't need it for non-storage devices, Caldigit makes them.