This is the zigbee safeplug that is listed on the zigbee site as a compliant device
http://www.safeplugse.com/spse-products.htm
And here is the product with its controller from the spse store
http://www.safeplug.com/store_us/index.php?target=products&product_id=38
Each additional plug costs about $70, where did you see one of these for $10? Got a link, I'd love to look into it.
I couldn't find anything about how they control it or an interface to it. Try sending them mail for more information