You can use Pine (yes I said it now let's get the popcorn), you can use aspen, you can use cypress mulch (including some blends).
Not sure where you are located but if you are set on Aspen here is where I get mine http://www.petfooddirect.com/product...ressed-bedding
I have a fairly large number of enclosures so I order 6 at the time and get free shipping.
You can also find it locally in feed store, tractor supply some walmarts
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