Stroller (buggy) for a five year old. Advice please.

Taking Matthew for his first visit to WDW in August, when he will be five. He doesn't generally use his buggy anymore, only for things like the zoo when we will be out and about all day. He doesn't have a great deal of stamina though and I know that he will struggle in WDW. Therefore, I have suggested to hubby that we have a buggy for him whilst we are there. Hubby is against taking our own as we are renting a convertible and he feels that there will not be space in it to get all our luggage and a buggy to and from the airport. Fair enough. So we need to get one out there. As I can see, there are three options: 1)Rent daily from WDW 2)Rent for fortnight from a hire company 3)Buy a cheap one from Walmart.
The main problem with option 3) is what to do with it afterwards. We are going back in 2014, so could potentially use it again but either storing it or shipping it home are going to be stupidly expensive!
Any advice welcomed.

I would buy a cheap umbrella stroller and leave it behind, if necessary. Where are you staying? Some of the resorts are huge, think of how tired we get let alone those little pumpkin legs. The umbrella is great in the airport too.
It won't take squat room next to his car seat in the car. We use to do this when both of my kids were in that 4-5 year age. Sometimes we would leave it parked in center of Future World, walk about and then put them in it going to World Showcase. DHS is easier to navigate without the stroller, AK, we kept it with us the whole time. It is huge and ground isn't level for little ones feet. We also left it near the hub in the MK until it was needed later in the day. If you ever use Disney Transportation it folds nicely and easy to straddle when sitting down.

Look for one that has a little net basket under the seat when open if you can find, my second one did.

I would agree that purchasing an inexpensive one is the way to go. It is a lot easier then having to deal with travelling with. When you are leaving just lookup a Goodwill station where they will gladly take the stroller as a donation. Google Goodwill Orlando Florida for locations and drop off times.