Welcome to Namepros @Leon Tippett , there are various way to get domains for resale.
If you want to have any particular domain in mind, see where is it listed. Negotiate the price, and list it in Afternic or Sedo or use your own landing page.
However if you want to register a domain, you can check domcomp.com for low price registers. You can also check promo section of Namepros for various offers.