I too, switched to Fox Points several years ago, and found them to be the most reasonably priced in my research.  They offer monthly payments - just be advised that they charge not only an interest fee, but a "handling" fee as well - which amounts to nearly 20% of the original fee charged.

That being said, they are great to work with - my contact is Marlane Rodriguez, 1-800-899-8624, direct at 1-678-529-6172, marlane.rodriguez@imaontheweb.com.  Good luck!