2006 Toyota Prius Hybrid
Prius's are being hit hard by low gas prices, your statement may have been true a year ago but no so much now.
Also a prius is good for about 500k, the battery is minor, a dead engine is under a $150 to replace (if you do the work)
The expensive stuff is if the "transaxle" or any of its components die.
I would never drive anything but a prius (or possibly a used volt) as a taxi.
As for the mazda 5, my luck has never been good with Mazda, but if you know them more power to you, the same site I provided can be used to find any car.
Worth a look, pig and a poke style
http://providence.craigslist.org/ctd/5701977256.html
Good Luck
Ryan