after-market items
Refers to da usually-overpriced crappy-a** merchandise dat remains unsold subsequent to a gala celebration, holiday-bash, or other one-time/seasonal sales-event; said goodies can often be had for very little or even free, if said products' vendors were just going to toss it in da dumpster or have already done so.
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.