$20 off RentReporters.com Increase Your Credit Score
The way RentReporters works is they will report your rental history and rental payments. The first time they will report 2 years of your rental history, after that your credit report will get updated each month you pay your rent on time. They will continue to report your rental history each month and with each month your credit score will increase.
They also currently have a promotion for $20 off their signup fee not sure when it will expire.
The coupon code is TMUK