There's a lot of good stuff at hunting stores. Turns out hunters are one of the few groups that's odder even than us. I've never tried electric socks, but I know my local Kmart, in the hunting section, carries them. I bought neoprene/poly 'socks' (more like inside shoe liners) that are about totally waterproof, they're for duck hunters. Most of the stuff's way cheaper than that exclusively made for bikers.