Motorized Wheelchair Needed

I have lupus and have been recently diagnosed with degenerative disk disease. Walking is hard and will continue to get harder. That was a tough blow but I want to prepare for this. I want to be as mobile as possible and with a motorized wheelchair I believe I can. But who knew wheelchairs were so expensive???

I have searched many sites, videos, and reviews and need to get the KD smart chair. The chair alone is $2795 the travel case is $350 plus tax. This is a lot more than I can afford.
Reasons this chair is peferable -
1. Is a weight that with my limited mobility I can still get in and out of my car.
2. Folds for traveling and storage
3. Is not bulky
4. Is motorized (I cannot push myself in a manual due to both back pain and arthritis)
5. It is the least expensive for someone like myself switch out insurance
Here is the link to the chair
 http://kdsmartchair.com/collections/featured-product/products/kd-smart-chair-heavy-duty-power-wheelchair?variant=1103644879 ‌

There are also a bunch of YouTube videos that show how it works that makes me believe it is the most accessible chair for me

Fair questions to ask
1. Am I contributing to paying for it?
Yes. I don't have the work income to even try and cover it but will be trying to get odd jobs within debate to put money towards it

2. Disability should cover it. Have I applied?
Yes. I have been turned down for disability 2x now and am in the process of my second appeal - the court stage. And while if I do get disability soon it may help pay for the chair but there are no guarantees that I get approved before my condition worsens

3. Why the heavy duty one? The other is cheaper.
It however cannot support my weight given the amount I've gained from meds