Amazon is having a promotion that they will take $60 off if you purchase 2 Ceton Echo's bringing the price down to $149 a piece. Not sure how cheap these have been in the past but thought I would pass it along to anyone interested.
http://www.amazon.com/Ceton-Echo-Windows-Center-Extender/dp/B008TZJ126/ref=sr_1_1?s=electronics&ie=UTF8&qid=1366243392&sr=1-1&keywords=ceton+echo
http://www.amazon.com/Ceton-Echo-Windows-Center-Extender/dp/B008TZJ126/ref=sr_1_1?s=electronics&ie=UTF8&qid=1366243392&sr=1-1&keywords=ceton+echo