So, anyway, I recently found these toothbrushes on a blog somewhere in the world wide internets (can't remember where) and they looked cool, so I bought some at Trader Joe's. Amazon has them for $17.93 for six (about $3 a piece--comparable to other toothbrushes, I think) and Trader Joe's also sells them for about $2.50 apiece.
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The handles are made out of 100% recycled materials, mostly recycled yogurt cups. And they're totally recyclable when you're done too--you just send them back in a little pre-paid envelope and the company recycles them. The company also makes razors, which I'll have to look into when I'm done with my Costco-sized quantity of razor blades.
Anyway, if that isn't all tree-huggery enough for you, we've also been using this:
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Okay, off the high horse for now.