Need a new used van

I have a conversion van. It's a 1998 Dodge Van Caravan and it is dying a slow death.  I am very active with my church. I am a lector and  also do the readings at St. Joseph Medical center in their chapel.  My financial resources are very limited and I really want to continue to be an independent 68 year old handicapped individual.  I am hoping to find a used van that is reliable.  I do want to say that there are not many places that have these vans for sale and they are really expensive.  I wish that they were not so expensive.  I was infected with the polio virus in 1952 and have been using braces and crutches since I was 3.  I was able to drive a regular car (with hand controls) for many years. Using the crutches has pretty much ruined my shoulders and now I have to use a power chair, which is why I need the special van with a ramp and hand controls.  I thank you for reading this and thank you for any help you can give.