$59.75 here http://www.ebay.com/itm/NEW-Genuine-Original-Samsung-5500mAh-Battery-for-Microsoft-Surface-Pro-1-2-/221798913272?hash=item33a43ed4f8:g:32MAAOSwgyxWVK7j
$14.75 (and cheaper) for the iPad...
http://www.ebay.com/itm/New-Replacement-Li-Ion-Battery-11560mAh-for-Apple-iPad-4-4th-4G-Gen-/201279062869?hash=item2edd2ac355:g:WUQAAOSwq7JUG-mD