$25 on Amazon. This was a pretty good deal and I have been having some problems with my other SATA docks lately so I took a chance with this one. This is the Plugable Communicator U3 USB 3.0 dock and it comes in white.
It has all the right specs: ASMedia 1051E and the latest firmware with USB Attached SCSI support (UASP) enabled.
Here is how it shows up on system profiler.
The speed is pretty amazingly fast.
First, here is is witha 3TB Seagate 7200 Barracuda spinning hard drive. That is close to internal storage.
A newer Crucial M500 240GB SSD. 430 MB/sec reads!
On an older Samsung 830 SSD.
For comparison, the Samsug 830 SSD (same drive) in a different USB 3.0 enclosure. To be exact, an Anker 2.5 USB enclosure found here on Amazon. Same drive, different enclosure. Big difference just due to the chipset and UASP support.
$25 is a pretty good price for a USB HDD dock. Overall, I'm pleased.