I would also suggest looking into purchasing one. You could check Craigs list or local listings in your area and see if anyone has a good used one that you could buy for almost the same price you would rent one. Then once you get home you could resale it and get some ( if not all) of your money back.
Do you have a local mobility store that might could rent you an electric wheelchair instead? I had a neighbor how had to go this route. It was not cheap and because she does not need one full time her insurance did not pay for it, but it got the ob done.
I would not suggest trying to get a power (electric) wheelchair instead.
First of all, they take more practice to drive because you are controlling everything (speed, direction forward or reverse, turning) with a single joystick.
It is not as easy or straightforward as it seems.
Power wheelchairs are much more expensive than
ECVs and because of that, plus the practice required, many places will only rent them to either someone who already is skilled during them or is doing a trial to see if they can use it as part of the 'proof' for getting authorization for purchase. They are also less likely to bend on age.
In most cases, power wheelchairs need to be transported in a van, either a wheelchair accessible van with a built in ramp or I have seen vendors and some other people transport them in the back of a regular van (with no back seats) using a portable ramp. That is not as easy as it sounds since you either have to drive or push the wheelchair up the steep, fairly narrow ramp.
If you truly have situations where you are not able to propel your wheelchair yourself for long distances, for things like shopping, you might want to look into whether you can get enough justification and an order from your doctor for your insurance to pay for one.
In our experience, insurance is pretty picky and Medical Assistance more so; they have the mindset that a person can only 'possess' one wheelchair at a time, even if the person can't walk at all. My daughter and a number of her friends have run into that.