Cypress mulch will work fine.

I've tried nearly every type of substrate (except "cage carpet" it never appealed to me). Currently, I am using my own "blend" of various substrates. It is a little more expensive but keeps my humidity perfect (my house is usually drier than I'd like and humidity can be difficult to get right, even in racks).

Currently, I am using Douglas Fir Bark, Cypress mulch and those Coco fiber bricks. I blend this all in a 2:2:1 ratio and have excellent results. The cypress and fir bark are approximately the same size "chips" and the coco fiber helps lock in the humidity.

Aspen is also a good alternative, but I don't care for the "hamster" smell (sorry, that's just what it reminds me of). Shipping paper (check out WalMart or Target or any store that has an office supply section) is cheap, clean and fairly easy to work with. It holds up better than paper towels and won't stain your snake's belly like newspaper. It costs about $2-$4 for a large roll and can easily be cut to size.

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