Re: Heat Pack/Wheat Bag - where to buy?
They are called Weizenkissen, Dinkelkissen (depending on the grain used) or simply Körnerkissen.
One can usually find them at an Apotheke - but sometimes also at Tchibo, Coop, Migros, or Manor or a Reformhaus. Check Amazon as well.
I *think* I've heard them called Wärmekissen as well - but be sure to specify that you mean grain-filled.