Tacoma's hold their value extremely well.
My suggestion to you is to come up with a price you feel comfortable paying, then offer $2k less than that and slowly work up to your desired price.
If you have a VIN number I can pull up an actual price worth paying.. or if you have a link to one you want just send it here, and I will go from there. If its something they bought from a dealers auction, I could probably look up how much they paid for it. But Tacoma's are hot commodities.