Keep watching their site, the last time they had them on sale they also had a 3 hour power sale special on them. I got mine for $241 3weeks ago during that 3 hour power sale.
http://www.ems.com/product/index.jsp?productId=3667574&cp=3677351.3737555.10756391
http://www.ems.com/product/index.jsp?productId=3667574&cp=3677351.3737555.10756391