Im looking for domain registration script to place on my website to make it easier to resale domains.. where can i find one?

Are you looking for a script or a company to resell with/through? All of the various registrars that allow reselling have some way to interface with their system. They range from "canned" sites to templates to full API's.

www.enom.com
www.opensrs.com

Are two of the most popular places to setup reseller accounts. If you're going to go with eNom, look for a reseller to set you up as a sub-reseller, as that will save you a lot of money.

Frank