You can find wool puddle pads on line. We're in Madison, WI so we got one at a local environmental bedding store. You can find them on-line at
http://www.satara-inc.com/
I think there's some at Amazon too. You wash them the same way you wash all wool- the important thing is how you dry it (air dry). Some wool pads need to be treated every so often with lanolin to keep them soft.
As per wipe warmers: if you use cloth (reusable) wipes they're actually quite useful! We put the cloth wipes in with some water (some people use a wipe formula that includes baby and tea tree oils). It's not so much about keeping the wipes warm as it is keeping them wet.