Do a Completed Listings search.
Go to ADVANCED Search to the right of the search bar.
Type in what you want to search.
Use the COMPLETED LISTINGS option.
Completed listings will show. Sold listing will have prices in GREEN. Check for your comparables. Check which categories they sold in and the prices they went for. Decide based on what you see.
I know I'm kind of geekie but I actually enjoy this part of selling.