Gentlemen:
Rogers always has an upgrade deal, but they offer it to select customers.
You can upgrade a Mobitex unit to a 6280 for $99, and a 7280 for $199. The catch? You subscribe to a 2 year plan, you pay $199 and $299 , but get a $100 instant credit on yhour bill when the old unit is traded in. You can do it with only a data plan too, no voice required.
Look at this guys:
http://www.rogers.com/promo/mobitex.html
Print this and give 'em hell, Rogers customer service is an army of idiots trained to say no.. no you can't deactivate you have to pay until the end of the month, no there are no deals, no i can't help you..
beat them down.. i'm an expert on it =)