If you're going to sell them here then make sure you sell them for exactly one tenth of what you paid for them, one quarter of their actual value or, better still, free! Otherwise you'll get hung, drawn and quartered for "ripping off the community" or something.
Make sure you only accept PayPal because everyone here is a fan of PayPal and will refuse to pay in any other way. EBay is good too, because we love eBay fees and so should you.
Don't forget to describe any broken parts as "working last time I tried them, but sold 'as is' due to age". We all know that is code for "buggered beyond repair".
Pour treacle into any keyboards before you mail them and add a few cigarette burns for good measure. Any loose keys should be yanked off with a screwdriver and superglued firmly into place (upside down).