When you buy your belt and buckle directly from C4, you have about 1,000 options, but you'll pay more. Solid colored belts run $29.99 while prints will cost $34.99, although C4 runs tons of specials (I just took advantage of a BOGO deal). Buckles are $8.00 for the regular plastic and $12.00 for the plastic "chrome" version.
One small piece of advice: when you cut your belt to size, do it carefully. I may not have realized that some of my jeans and breeches are low rise while others sit higher on my waist. If you also plan on putting on a few winter pounds, that belt that was cut for a higher waisted breech might not fit your low rise pants any more.
So yeah ... I have four belts that I am now using on the very last hole and only with certain pairs of breeches. Cut wisely people, and stay out of the fridge!