When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
There are lots of guilds on how to remove your stock HU on this forum. Just follow those steps to take it out and putting another oem HU back in should be cake, since you don't need a harness, its just plug and play. As for cost, why not see if another member on the forum would sell their oem HU. I'd sell you mine since I'm putting in a system soon but CA is a bit far from Philly.