The combination of a steel frame with plastic face is way cheaper than a solid steel buckle. This is the steel frame for a belt buckle. The plastic buckle face/cover (I also sell) simply slides over this frame and is secured with a #6 - 1/2" countersunk set screw. Works great! And you can interchange buckle covers. Meaning you only need one frame.
You can either buy my polymer belt buckle "faces" or make your own (if you have a printer of your own).