When I worked for the Physical Plant at my university, we had to dismantle the old chemistry lab for new construction. In the center of the two-sided lab tables was a small opening running the length. When the sections were moved, odd things were found that had gotten dropped for years. One was a Hershey bar 8oz..with a 5¢ price!
The other was an old empty Luck Strike cigarette package that was green! During WWII, free cigs were sent overseas with the slogan "Lucky Strike Green has gone to war!"

...and re: prices. In 1947, I was in 2nd grade on New Orleans. The ice cream cart came by (pedaled) and popcicles were 6¢... one day we kids were upset to learn the price was now 7¢! Only a penny? Yeah, but look at the % of change.
   In the 1960s, when I worked in grocery stores, there were prices like 23¢ for a can of peas, and if it went up to 25¢, people noticed.
Now, very large profits can be hidden in prices with often end in $0.99. (and TV sets at $999.99?? Who do they think they're fooling?)