Fritz Blue Box. Don’t look for it on the BRS propaganda videos, because they don’t sell it. I switched when I couldn’t find TM over a year ago. As long as you mix it slowly, and not over-temp, it mixes clearly, and, iirc, to very similar parameters as the TMP. Just my two cents.
I was in Aquatic Warehouse in San Diego Saturday. They were unloading a couple pallets of TMP. I don’t know if though if they ship or not.
Also, be aware, I heard locally they are price gouging for it.
I was told they’re selling at 145.00 per bucket. I can’t verify because I didn’t ask, could just be rumor. So nothing more than a heads up.