Have a look at these, both of them are in the U.K. and have reseller features, from what I can see pixel internet comes above your budget though. I would just email them and have a talk to see if they can help you.
http://www.ereviewguide.com/ecommerc...eart-internet/
http://www.ereviewguide.com/ecommerc...ixel-internet/