Reddit reviews 1" - 24 Right hand Thread Die
We found 2 Reddit comments about 1" - 24 Right hand Thread Die. Here are the top ones, ranked by their Reddit score.
1" - 24 carbon steel right hand thread Die24 Thread Per Inch55mm Outside diameter
Since you'll only be using it once you could cheap out with this one from Amazon.
https://www.amazon.com/Right-Hand-Thread-Die-TPI/dp/B008BDIGM2
So that's intriguing, but it's important to note two things which you can read in the first review of it. One is that it doesn't include the alignment die that the Park has, so you either need to rig something to keep it square or risk having your threads cockeyed and applying pressure to the bearing unevenly.
The other is that it's not made for bikes specifically and, at least according to that review, cuts deeper threads than is standard for a headset. That means that you have weakened your steerer, perhaps too much if it doesn't have a lot of extra thickness.
Less important, but the die is from merlintools. The $40.74 is for combining that with a handle from Grizzly. Nothing wrong with that--if you combine it with a handle from Merlin it totals $73.98.