https://www.amazon.com/unsweetened-tea-powder/s?k=unsweetened+tea+powder
https://www.walmart.com/c/kp/unsweetened-instant-tea
Like I said to Ansel12, this is a new product that has just become available (the Lipton Unsweetened Instant Tea). It was not on the market last month.
The other tea (Waka) on Amazon is too expensive.
Thanks for the links!