Not sure if you have a Lowes up your way or not but I think that would be your best bet. Get a Porter Cable 7336 and buy a backing plates and pads from somewhere else. Or maybe some other tool store that carries the Porter Cable brand would be able to order you one...
I personally like this kit from Autogeek:
http://www.autogeek.net/hk7424.html
Or Dwayne at PAC has a regular PC on sale for $125 and he also has the pads and BPs there aswell.
Just shop around a little and you will be able to get the feel of what is popular and what is a good price.