I also think kiln dried
bedding is fine. You can get a big bale at feed stores for usually under 4$.
But if you want to change to something else -for piggies you can use towels (not the big loop kind) and polarfleece, blankets.
I use towels with polarfleece on top of towels in the upper level part of my cage. The downside is you'll do more laundry with that idea. I shake out the poops outside and have a couple more loads of wash a week. But my pigs stay downstairs in their cage more so the upstairs dosen't get too dirty.
You can sometimes get good buys on polarfleece at fabric/craft stores- some I bought for under 3$ a yard which I thought was great.
* I'll tell ya it is so much more easier too roll up towels than dust panning up all the shavings in my cage. I thought about switching to all towels and fleece.
well that was long!