Most of the isopropyl alcohol that you see in stores is 70% concentration. Occasionally you will find the 90% concentration, and I usually buy a bottle or two when I find the 90%.
However, I am running low on my 90% and have been looking to resupply. I have checked Wally World, Target, CVS, Walgreen, grocery stores, etc. but have not found any 90%. Is it still being sold? Have you seen any for sale anywhere lately? If you know of a vendor who regularly stocks it, please let me know where you last found it.