$525 gets you a 28-2 4" with some holster wear and non original grips. Good bench mark. In my area of Wi, Most Of the late 60s - 1980s two digit model 38 $ 357 s&w wheel guns in good to very good condition with original grips go for $525 (+\- $125). Boxes etc add more dollars.
There are limited dealers and lots of old people. So prices are fixed to a general range, but there is semi regular inventory because of all the retired folks wanting the pistol out of the house because of the grand kids or estates.