http://www.dipmicro.com/store/BTE-RCB2011 This one uses Prolific PL2302 USB Driver with 12MHz crystal for the USB/Serial interface.
"Compatible with Arduino UNO 2011. You will need Prolific PL2302 USB Driver. Select Prolific serial port and Arduino Uno in Arduino IDE. Also includes USB Cable. Works with XP, Vista, Win7, but NOT Win8! "
Made by the same Chinese group that makes the 'better' CP2102 modules (with DTR pin accessible on a thru hole pad)