Rental domains are a very strong seller check them out for yourself.

MovieRentals.com $100,249 Apr 06 SnapNames
CanadaRentals.com $41,861 Sep 06 SnapNames
RentalIncome.com $20,000 Apr 06 SnapNames
UniformRentals.com $18,000 Oct 06 Moniker/Traffic
BeachHouseRentals.com $16,800 Jan 04 DomainSystems
VacationHomeRentals.com $15,000 Nov 04 Sedo
VactionHomeRentals.com $15,000 Jan 04 Sedo
MotorcycleRentals.com $10,750 Dec 05 SnapNames
FilmRentals.com $10,700 Dec 06 BuyDomains
MyVacationRentals.com $10,000 Dec 06 Private
VactionRentals.com $9,210 Jul 06 [...]