The xtherm is so warm it's like sleeping on magic ;)
This is a little bit sneaky but will get you an xtherm regular for about $130. You need a discover card though or a friend who has one.
1. Get the lovely people at moosejaw.com to pricematch omcgear.com with their 20% off discount they are currently offering (code TAKE20). 189.99*0.8=$151.99
2. Pay for the xtherm with discover card as they are currently doing 10% cash back if you buy through the link which can be found from within your discovercard account. 151.99*0.9=$136.79
3. Use the moosejaw points to buy something. If you use them to buy something you would have bought anyway then it's another 5-10% off. 136*0.95=$129.95
Ka-ching! Hope this helps.
EDIT: Doh! Just noticed you are in Israel so my post may have been rather unhelpful.