Around the Hounds makes beautiful martingales (and I believe she does buckle collars as well). Another greyt source is Majestic Collars!

Most of our collars are 1 1/2 inches. Tag collars are always 1inch and some of our hounds have some fancy 2incher b/c they have the neck to pull it off.

Here's Hanna saying "BUY ME MORE COLLARS NOW MOM!!!!"