Selling it is an option, but you can also visit a junkyard and see if they can sell you one, tell them your make, model, etc. Also you can look on voluparts.com, but for the cheapest motor you will probably do better at a pull a part or junkyard. Hope this helps! What happened, Volvo are usually very good cars, did the motor lock up?
I had an internal oil leak that got down into the pistons. The mechanic said the damage was too great and the whole motor needed replacing. I was at my wit's end. Luckily I have awesome friends that will see that I get to work.