You can often pick up after-market items for next to nothing if they have "gone stale", either because they are actually perishable goods and thus are starting to no longer be saleable after the sales-event is over, or because they are season/event/holiday-related (such as spring-gardening accessories, Independence-Day ephemera, personalized wedding-trinkets, Valentine's Day candy, etc.) and therefore would no longer be of interest to most buyers. If you know a creative way to make use of said sundries, however --- like if you can chop up flashy decorations to use as glitter, re-label imprinted items to use for another purpose, pass out random items as party-favors to open-minded/good-humored folks who don't mind the "invalid-to-the-event" nature of said baubles, etc. --- then by al means, knock yourself out... just be careful that you don't allow said gleeful foraging turn into a free-food fiasco, whereby you gluttonously gorge yourself on all kinds of refined/sugary/salty crap that's been discarded, and which therefore is indeed totally "up for grabs" but would not be healthy to consume in large quantities, especially if you are on a diet to lose weight or otherwise needing to watch your calorie/carb/sodium-intake.

Person A: Man, that nutcase Martin Bryant guy shot 35 people in Tasmania!

Person B: No, he wasn't a nutcase, that was just a psyop so the government could have an excuse to ban guns.