I don't use it for the snakes, but I do use it for my feeders. I get a bag at walmart for $3.50. It's a small bag, and compressed. I can't remember the exact measurements, but a half bag covers my 50 gal really good. Nice and fluffy looking I know it's a small bag, but for $3.50 i buy two at a tiem.

I found it in the pet section by the hamster stuff. I'll try and get exact measurements for you when I get home.