check craigslist in wisconsin. you will find people selling from $100 to $500 for 10hp and below. in the green bay and appleton cl, there is a brand new 6hp with warranty for $1500 and a brand new 4hp iwth 5 year warranty for $1200 listed by a dealer
based on the age, you should be able to get 2-300, however this time of year in Wisconsin, plenty of boats and motors being sold as they are being pulled from the water in prep for winter