Like if you don’t care about getting a Candy cab, American style cabs in reasonable condition can be gained for cheap.
You got to do your foot work, your homework on this one. Check your local classified listings, Yellow pages, check Craigslist, ask local businesses that deal with Arcade Cabs (even if its a pizza join or laundry mat with a cabinet).
You might need to borrow or rent a truck when it comes to the time to buy the Cab. You might have to drive for a few hours to get to your location. Very few places do deliver. Ask to see the cab in action if possible.
Even then you are looking into doing some cleaning and repair work.
Like Frank Said each geographical location is different, like me near Baltimore there plenty of opportunities for cabs.