I work on classic vehicles daily.
Just yesterday i needed to pick up some power steering fluid and ATF for a 1973 vehicle i am working on That i just replaced all of the steering components. I was just looking for a cheap Dextron to top of the transmission. What used to be $2.00 is now $7.89. The parts that used to be available at an acceptable price at most part stores like a power steering pump has doubled as well, that's if you can find one.
My guy at the parts store that i have been dealing with for 20 years came out and said yea, parts that were once $30 not so long ago are now $130.
Even if you want to do a service on your automatic transmission its over $100 for just the fluid. An oil change with a good quality oil and filter is just about the same.
It is not getting any better.

I get most of my oil from Walmart and use their brand of oil, I have seen tests of the oil, and it compares to the name brands. I check Rock Auto for AC brand filters, they are usually the cheapest but sometimes the shipping costs more. I also compare prices with Amazon because of the free shipping

I just ordered conventional Pennzoil 30W (as I've always used in the '68) from Amazon.

When I saw it was a case, as pictured, for $38.49 I thought, "wow the price has really climbed." Then I saw the "case" was 6 quarts, not 12 like they were since always. Good grief.