Where to buy high quality Aspen shavings?

I currently use shredded Aspen bedding, the type they sell at the local pet stores that has a milksnake on it. I'm not too fond of it, and I've seen some people say they use higher quality aspen "shavings", I was curious to where I can find this? I've checked local stores to no avail.

I've been going to a farm supply store (Mills Fleet Farm) and buying 50lb bags of shredded aspen for $3.99 each They sell it as horse bedding. It's very dry with a low amount of dust.

I use the aspen for my rats and mice, I stick with unprinted newspaper for the snakes.