How about a Cessna 150 or 152 Aerobat?
I bought an Aerobat and converted it to a Texas Taildragger. Of course it is not a Pitts but I can legally give both aerobatic and tailwheel training for a very reasonable investment, not to mention it is cheap to run as far as fuel cost is concerned.
The conversion cost approx $3000 USD for the kit and S.T.C. We worked around eighty hours to install the kit.
Makes for a sexy looking Cessna 150 with a new paint job and refurbished interior.
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The hardest thing about flying is knowing when to say no.