I'm not surprised. I commented in here a while ago that I thought it was discontinued since it was getting harder to find. It was still on P&G's web site at the time.
Wonder why P&G stopped selling it. Probably low sales and not worth supporting by a company with $83B in annual revenue. Colgate would sell off smaller brands when I was there. Things that were still, but not worth the support for a multi-billion dollars company.
TSP is great stuff. Companies had to take phosphates out of laundry detergent years ago.
I make my own laundry detergent: Borax (sodium borate), washing soda (sodium carbonate), and Fels Naptha soap. I separate add a little TSP to the washing machine for an added boost. Great stuff. :)