In Canada I would expect $599 off contract and $199 for 3yr contract, maybe $249... Carriers seem to be willing to provide about $10/mo discount on a contract.
They will want the device to have good sales out of the gate, and anything above these numbers could taint the launch.
Buy a BB10 device outright. Then sign up for a 3 year plan from Bell. You save 10% on each monthly bill. It's almost like grabbing a device on contract and subsidising it yourself.... LoL