I can only think of one missed purchase opportunity that I continue to regret. About five or six years ago, I walked into a Goodwill store and saw a pristine looking Kirby G5 and an equally shiny Royal upright with a matching burgundy color scheme, each priced at $20. For whatever reason, I couldn't justify buying them both, nor could I decide between them, so I walked away. Over the next 24 hours, I couldn't get them out of my head and went back the next day for a second look, and of course, they were both gone. I periodically think of those machines and briefly kick myself for my indecisiveness. The fact that that's the only missed purchase I regret probably means I've given in and bought too many since then.