Busy Buddy Refills
https://www.amazon.com/PetSafe-Refill-Treats-Natural-Rawhide/dp/B001F0RRTQ/ref=as_sl_pc_qf_sp_asin_til?tag=alspuboca-20&linkCode=w00&linkId=36df092da46a7e01bc15b52b724cc755&creativeASIN=B001F0RRTQ
$3.41 - $17.99 (Depends on size & qty)

Quality and performance driven products for your pet. Tested for safety and health.