Call Qualcomm (look on the website) and ask for the representative who handles your carrier's account. Tell them you are an owner operator who wants to purchase equipment directly from them. I believe they are going to want you to sign a 5 year contract for the $50/month service, plus they may want to charge an additional 3 cents a message (maybe not). The equipment is $2250, plus approximately $250 to set up the new account, plus some other fees and expenses (probably not more than a couple of hundred dollars).
A couple of things to think about are coverage in the event that your unit is stolen or damaged. Another thing would be what happens if the equipment becomes obsolete and you have to upgrade to new equipment. Long term, the purchase option could work really well. Plus, you could sell the equipment if you wanted to, though I'm puzzled that there seems to be so little used equipment out there.