The analog version retails for just $518 and can be found on-line at a deep discount DT analog tension meter for $369

In all seriousness, $50 for the Park is as good as you're going to do.

With light alloy rims and enough spokes you can get to the same place without a tension meter by alternately increasing tension and stress relieving until the wheel deforms in waves (indicating you reached the rim's elastic limit) at which point you back off half a turn and re-true. The last pair of wheels I built that way came out at 110kgf front with no tire +9/-5% and 110kgf average rear drive side with a tire which is where I'd have ended up with a tension meter in front and a hair higher in back (an inflated tire decreases tension).

That doesn't work for deeper rims, heavy rims, or lower spoke count wheels where rim rigidity is no longer the limiting factor for spoke tension and the Park TM-1 is a fine idea.