Hi, Just to let you know Medicare will pay for a wheelchair if they have NOT already purchased a walker. Strange but true. You will need an Rx from her doc. Also, there are many different types of lightweight collaspable w/c's available. If mom will never be pushing herself you might consider a companion chair. This type of chair has 4 smaller wheels and is lighter than a standard w/c. Used w/c's can be found at substancial savings. Look for: good brakes, good seating, no tears, no cracks in wheel rubber, if it has removable armrests or swingaway, elevating leg rests-make sure they work, fit the chair correctly and work well. If mom is a larger person, over 250# she will need a wide w/c, these are more expensive but worth the cost.
I suggest calling local Medical supply stores. Check the local paper for w/c's too. There are a wide range of prices. A new standard wheelchair without accessories can be purchased for approx $400.
Happy w/c shopping!
Joan