I gave $375 for a 4" unfired Lawman last year. That included shipping, so I figure you can deduct about $25 for that, leaving $350.
The 2" seem to be a lot more valuable to owners (and sellers), but the going rate on Gunbroker hovers around the same, maybe a high of 400+.
Don't know how much help that is, but a Gunbroker seach is easy enough.