Hi Deb,
Mobility vans are NOT cheap, as you have noticed. I therefore recommend getting a used one, like I did. Unfortunately, I think there's a high turnover rate from people passing away. Yikes!
I would start by putting all your friends, relatives and acquaintances on notice that you need one. Mine came through a friend who went to church with a woman who's husband had recently passed away. It was only one year old and had under 9000 miles on it. All garage kept. I saw the receipts and the new van plus conversion cost $55k. I paid $34k. I know that's still a lot but not very far out of line from a new car. You can get older ones with more miles cheaper, but it was a good deal for me. I highly recommend finding one from a private owner to avoid the dealer mark up. Try to find a little old lady who only drove it to church on Sundays, like I did! Lol! I've read the two big players in van conversions are BraunAbility and VMI. Mine is VMI