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I found them at O'Reillys under the "Murray" name, but they are the same. I paid $7.50 for mine. It took about 6 months (and 1 Dallas summer) for it to fail open and my engine temps are normally 190 and never get over 210.
I'm going to go with another one, but if it fails quickly again, I'm going back to the conventional tstat.
I used them on a DD with a Buick V6 the first one lasted a week the second about 3 days. I went back to a conventional Tstat and never looked back
Maybe the voice of dissention, but the thermostat only controls the low end of the operating temp range. If you're too hot, you need to look elsewhere. The radiator, pump, or airflow needs attention in this case.