If it's pine or a pine blend, I'd avoid it for the snakes. A really good quality pine with no dust is okay for rodents if they are well ventilated but for snakes...I'd pass on pine products.

I know someone in the forum was mentioning they found a great deal on aspen at a feed/tack/farm supply type store. It was being marketed for horse bedding but was a lovely pure aspen bedding. Sorry I can't remember at the moment which thread or who that member was unfortunately.