Dnsale.eu domain is complete turnkey wedsite with the domain parking and auction modules.

DNSALE main functions:

Manage all your parked domains from one place
Import your own parking themes; 3 default themes to choose from
Keep track of full statistics including views, clicks, revenue & RPM
Create parked domains or mini-sites with paid RSS feeds & Google Adsense
Supported XML feeds include; Affinity, Google Adsense, Miva, Searchfeed, XML Revenue and Yahoo! Publisher Network

Run live domain auctions from your website with the ability to set starting price, reserve and BIN
Make counter offers on domains
Send messages to other users, using the built-in messaging system
Latest Auctions, Latest Entries, Latest Sales & Showcase Entries supported
Accept payments with Paypal, MoneyBookers and Google Checkout

Website is running on open source script.
A price for site is without payment for hosting, but I`ll help you carry it to another hoster.