The new Disney Visa price is, well, new. Before, when it was free, you had to get in line each and every day to get your voucher/receipt then pick up the stroller.
They do have a way to pre-pay all of your days (we did it Dec '07), and though it does not save money, it saves time, because you don't have to stand in line to get the receipt each day. They give you vouchers for each day, and if you keep your stroller nametag, you just walk up to the stroller-giving-out spot (LOL), hand over your receipt, show your nametag, and they'll give you the stroller. If you need a nametag they'll make one for you no problem, by the way.
So now the question is...will they be combining it! And I doubt if many people know at this time, because charging for the Disney Visa stroller is brand new. And people who got the free strollers weren't used to doing the multiple day rental, because they couldn't.