We own a 2008 Prius with 150,000 miles. Due to spending its life in the snowy North, it now has a rusty underbelly, which is causing or exacerbating a variety of problems. These problems are, probably, fixable; but doing so will cost somewhere around $2,000. We are not going to attempt to DIY any repairs; we just don't have the spare time or mental capacity to handle it right now. These repairs are necessary for it to pass inspection, which will need to happen before a new owner can register it, or in spring of 2020 if we still own it at that point.
For entirely separate reasons, we would like to get a different car. Reasonably frequently, we need to take 6 people someplace, and its starting to be a pain not to be able to fit everyone in our car. Current plan is to buy a used Mazda5, which seems like the smallest & most fuel-efficient 6+ seater to be had for a reasonable price.
So, my question is about the best way to get rid of our old Prius. For environmental reasons, we'd like to extend its life as long as possible, so we don't want to just junk it, even if that's the easiest or cheapest route. Should try to sell it as is, hoping that if it is priced sufficiently cheaply ($1000?), someone with DIY skills will want to fix it up? Or should we do the repairs ourselves, then try sell it for slightly more money ($3000?) as a functional vehicle? In either case, we won't be repairing cosmetic issues, and the car does have quite a few small scrapes due to years of street parking.
Thoughts? Would also welcome suggestions on alternate 6 seaters.