Kevin,
In the US the prices of used winchester 1892's vary somewhat. Here in the southwest/pacific coast, they are high. I recently paid US$350 for a .38-40 with rust pitting, broken stock, and fair bore. Unusually low because the seller wanted funds for another gun.
Generally, the .44-40 is most desireable, either in carbine or rifle form, with the .25-20 and .32-20 in less demand. The Cowboy Action shooters gobble up original pieces, and push the prices up.
Standard prices for shooting condition (good/fair) m1892's range from US$800-US$1000 and more. This includes cut-down, rebarrelled, and modified pieces. The prettier guns bring a lot more than that, and are sought after by collectors. I recently attended the Reno and Las Vegas antique gun shows, and prices were way up there. It's hard to find a fixer-upper for less than the US$800 I mentioned.
I wish we had easier access to those thousands of Canadian M1892 guns used on the frontier for over 100 years, but the tightening up of gun importation/Canadian exportation laws makes it less likely for US buyers to find true bargians.
HTH
John