i bought mine off of ukc or coondawgs cant remember but also ebay but i wouldnt go that route unless u talk to the guy ahead of time but i have a innotek rd-400 its ok but look at the icom or wildlife collars the most frequent collars are .217 and if you go on ebay someone rebuilds collars around $100 and sells alot of em so just look on there u might find a decent deal i bought mine for 400