I'm a collar fanatic! Trust me, you will have more than one, LOL. I like etsy.com... it's people who personally make collars, so they are one of a kind and really well made. Ebay, you can also find a lot. Of course Petsmart and Petco offer some decent ones, but they're not my favorites. As for harnesses, Jackson has 3 Puppia's and 2 from YT user chattiesmom.