I bought a 1.5" all leather belt from Carolina Rod and Gun for around $30-$40 that I've been using for almost two years now. Works perfectly, and is comfortable!
I paid about $30ish at Carolina Rod and Gun a few years ago for a 1.5" solid brown leather ( there are "leather" manufacturers who use a paper mache in the center with a very thin layer of leather on both sides which will break if used for guns so be careful when choosing ) and it's been serving me strong for quite some time; I don't need to tighten it to the point of crushing me when carrying my full-size HK P30 and with the UBG Holster I use it just becomes a part of you and makes for a comfortable combination.
I either use a Crossbreed gunbelt from Crossbreed Seconds or a nylon Wilderness Tactical.
Another good option if belts just don't seem to work well for your build is to add a pair of suspenders. I recommend Perry Suspenders. (Links below