Sounds like you've found the wood stove pellets.
They're good....and at a good price too.
They may be a seasonal item, so after winter time you may not be able to get them.
Stove pellets aren't quite the same as the bedding/litter wood pellets.
Stove pellets are generally made of hardwoods to provide optimum heating properties. They may not absorb or control odor as well as bedding/litter pellets.
Bedding/litter wood pellets are mostly made form softwoods allowing for better absorbtion and odor control.
I purchase WoodyPet from my Agway store.....costs about $7 for a 30lb bag.
Agway also is a distributor of products made under the Southern States label.....which makes a premium pellet bedding (softwood pellets).