What would be a fair price to sell some winter tires for. Details below

Problems with selling tires only is that, buyer can't see if there was damage like a hole in the tire.

With tires on the rims pumped up to proper psi, you can hear and sometime see a hole with or without a nail in it.

Having said that, see what others are selling used tires on Kijiji or price it accordingly like 50% of what you paid for to sell it sooner then later. Also, selling when they are more in demand like in Fall/Winter will net you even more money sometimes.