The answer is there is no clear answer. It's about $45 or so to go to the hot spot w/ 4GB monthly. But of course we have an enterprise account that gets you a lower rate and a 25% discount, so I think Bruce is right for the average account. Out corporate account is so complicated they could only give me an estimate (we only have 60,000 employees, with half of them on company cell service).
But I am going to upgrade to a 4G air card for the router.