Real Estate Classified Script (for land sales)

I am looking for either an out of the box real estate classifieds system to sell LAND only. Out of the box it should be able to support a credits-based subscription system that would allow a user to create an account, purchase 1 or more credits and post their classified for land they have for sale. This doesn't have to be a custom job, if you have a script already to do this or can hack up what you have to meet my needs, that's fine. The admin should be able to manage subscriptions, users, add/delete credits manually, manage listings, etc. If you have a live demo, you may send me a message and I will look it over. Live demos are appreciated.