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Best place to get one is an antique radio club or ham swap meet.
I keep a B&K dynajet 606 for octal/loctal to end of the tube era compactrons which works quite well. I work on any TV with tubes so every socket on it gets used.
The dynajet though don't test anything pre-octal so at a MARC Extravaganza meet a year or two back I bought a restored Heathkit tester for 40$ which has the early sockets. It is nowhere near as good a machine as the B&K, but on the early tubes it gives me a far better idea of performance than tube swapping (my testing method before I had it) ever did.
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