How much for a mossberg 183ka?

I just bought one today at a gun show in excellent condition for $110. They were asking $160. I also saw one in fair condition (I'm no gun expert, but there was some rust on the metal and significant distress of the stock's finish). That gun had an asking price of $89. I'm still not sure if the 183ka is, by default, a .410, but both of these were. I also saw what appeared to be the same model in a 20 gauge a couple of times, and those were in good condition for about $125.