This is just a shot in the dark, but I did find through the blackberry website that Vodafone & TIM are 8700 series service providers.
I was hoping to find some prices but the problem is I don't understand the language. Maybe someone else here does.
I even tried the AltaVista Babelfish, but I am clueless.
Here are the webpages I found though...I hope someone else can be better help. Vodafone TIM
Here is the blackberry page that had the service providers listed: BlackBerry