A new MiniDV camcorder...
There is no other affordable solution which will play a DV tape (DV tape decks are rare and cost more than a camcorder).
If you use the analogue output from your current camcorder there would be other options, you could use something like this to convert the analogue back to DV
http://www.canopus.com/products/ADVC55/index.php
but obviously keeping it DV all the way is better.
Mark