I upgraded to a fx8350 so I have no need for the 4100. its about a year old and it works perfectly, I still have the heatiink, box, and warranty manual of authentication. how much should I sell it for?
Maybe try and sell it on ebay. I would probably list it at $25 to start things off, and let the auction run between 5 and 7 days. You can also put a reserve price on it so that if the bid do not meet your expectations, then you do not have to sell it.
Of course there are fees associated with ebay so you should look into that 1st. Setting a reserve price is likely to be an extra fee.