These pads come extra with the XPT100. If you'd be up for selling them, let me know!
I'm not too sure what they're worth, so we can sort that out.
They are worth approximately 23.99 plus shipping when (if) they come back in stock: http://www.sonicelectronix.com/item_66627_NVX-XRE100A.html. Unfortunately, they have been out of stock for a while.