I use copious amounts of mineral spirits in my shop, from wiping "gunk off stuff", thinning, cleaning spray guns, etc. Usually buy 2-3 gallons "every few months". That's all I can fit in my flammable locker. Last time I bought was in April 2022 12.97, March 2022, it was 12.58/gal, which was the same price as April 2020. Today it's 17.98 at Lowes, 18.96 at HD (and it will be 18.97 at lowes by the end of the day. Their prices are always within 12 hours of each other in my market).
There is zero chance that "inflation", oil prices (which are going down), etc resulted in a 4$/gallon increase in 4 months where it's been steady for the previous 2 years other than price gouging. Amazon, Walmart, all the same.
Getting priced out of WW as a hobby, I can't even afford to do WW for house maintenance now. Don't get me going on blue painters tape, which I also depend on.....