Well i am selling a booking system i made in php OOP, user management is up, login system, and articles management is basically up just have linking issues ( too lazy to fix ) but the only thing really incomplete is booking management.
If anyone wants a booking system that is pretty top notch other then that its incomplete go head and check it out at
http://www.blakejeffery.com/booking_system/ and login with username admin and password test.