My mom still does this. She was born right before WWII.College Cooler was an expert at the cheap. Sunday meals of Cub Foods samples happened more often than I'm proud of.
Fresh outta college, Totinos party pizza, PB&J and ramen were still in the regular rotation for longer than necessary. We also used to wash out Ziploc bags and reuse them.
These days, I make a big deal about the cost of subscription services (Hulu, Sirius) that I'll use, but have little issue dropping that same amount of money on something stupid on impulse.