Hi Wisk there is one on ebay at the moment with the foam backing in the US. $150
http://www.ebay.com/itm/261003402814?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649
I am also looking to buy one of these but one without the foam backing because I am from Australia and the postage is not so great on something that size and would probably break. If anyone has one that is not on a foam board and is the original size 17" x 34" please let me know how much you will sell it to me for.
Or you could email me at oi_son@hotmail.com