Don't bother with Davis Micro. I ordered one of these with expedited shipping, advertised as 3-5 business days. After two days the status of my order went to "Processing (1-2 business days)." After it sat there for a week I emailed them twice and sent them a message on their messaging system, with no response. Then I called, to speak with a shrill woman with limited knowledge of English who screamed at me that there was a problem with my payment and I would have to email them, then hung up on me. Of course, my payment had been processed the day I placed my order. I've filed for a chargeback and wouldn't recommend anyone bother with them.
Anyone know a reputable dealer who might be selling these in the US?