If you're talking corporate plans, then some of us work for companies that such an arrangement is in place. Usually they are fairly standard. The "EPP" is a good estimate or base for a lot of the ones out there. Some even include discounted wireless services and upgrades as well.
Just remember that if you do go with a corporate account, you usually need some sort of employee ID or proof that you work at that company. If you don't, there is a risk that you'll get bumped from the plan you try signing.
Well the reason I am asking is because I met someone and he said that his father has a company with 600+ blackberries so his bill comes down to around 20$ (unlimited everything bla bla bla), I was wondering if that could be or true or if he's bluffing...