I get mine on ebay. They are from Best Bully Sticks but the price is a bit better than on their online site. Free shipping.
BEST BULLY STICKS 5 CT 12" STANDARD NATURAL Dog Chews | eBay
They are life savers for me. They keep Gracie out of trouble. She really needs to chew sometimes and if she doesn't have a bully stick she will seek out and find things like plastic or wood to chew. As long as she has her bully stick available she is fine. I think these also come in the "odor free" form but cost a bit more. The odor really doesn't bother me as long as she keeps them on the floor.