I'm trying to decide if it's worth selling outright, or if I should just do something like macmeanoffer. I have a late 2013 iMac 21.5" in mint condition (original box, though I think some of the styrofoam from it is missing, and all accessories in perfect condition). It is the "base" model for that year, so the 2.7gHz Intel Core i5 processor, 8 gigs ram. How do I find out what this is worth to decide if I want to try and sell myself?