Affordable Wheelchair Accessible Transportation from Minneapolis (MSP)

Anyone have any experience securing transportation from MSP to Mayo that is manual wheelchair friendly and doesn't cost $300 one way? Spouse can self transfer (but not to the height of a passenger van). Groome Transportation has an accessible van but it has been "in for repairs" for more than 6 weeks and they can't give a clear answer when (or if) it will be repaired. I have just over two weeks to secure transportation for our first trip to Mayo. Thank you for any leads you can provide!