I just bought one 9V battery from the local CVS, and it was $10. The two packs were about $14.
Going from $1.75 to $10 is a 471% increase, and back then (in the ’70s or ’80s), you got TWO batteries for that price.
At .99 cents a gallon we used to fill up our gas tanks with a $20, and have money left over for lunch.
Now a full tank and a lunch from Wawa will run you about $45.