Try eBay,lots there.
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Do some searches on audioasylum.com.
For $50 you are not going to get anything useful, IMHO. Better off just buying from reputable sellers unless you can budget a couple or three hundred for something good. (including calibration of it). Mutual conductance (transconductance) type is the best (only?) choice.
I agree with Ed, $50 worth of Tube Tester doesn't buy you much. There is pretentiousness throughout all of our hobby, but this is one area where I believe it is worth spending a little money. A bad tube that shorts out will take out circuit components, which will cause down time and repair service expense if you can't do the work yourself.
Maybe a friend or Audiogon'er in your area has a tube tester that you could use? You may also wish to ask members of local audio clubs or your local dealer.
Where are you located, Dudeaudio? I'm in Spokane, Washington.