Handwoven Persian rugs have been appreciated quite a bit over the years, although it will take a long time for that to happen. That rug your great-grandparents bought may just be worth a lot more now.
Rugs that are over 100 years old are deemed antiques, and their price is determined by size, material, condition, knot density, and design.
Old stamps
The American Philatelic Society (a society for stamp and stamp collectors) says that while rookies begin collecting any and all stamps, expert collectors know that certain stamps are from other countries, specific regions, and for special events. Over ten thousand new stamps are issued each year worldwide, says the society. Mint condition stamps (never been used) sell the best, but used ones can still bring in the paper.
In May 2019, a collector was selling his entire collection on eBay. Opportunities for reselling are pretty good, and the investment is pretty low!
Lego trains
Do you remember what it was like to build your own toy entirely out of Lego? This was another playset that all of us can fondly remember. With these toys, you could allow your imagination to run free and create almost anything you wanted.
Take two things that people are widely passionate about (Lego + Trains), and you have one awesome toy. The Steam Cargo Trains, Diesel Freight Trains, and High-Speed City Express trains can all sell for $1,500 to $3,000. Wow!
Jewelry
If you've got some of your family's old jewelry hidden away that you've been holding onto for its sentimental value, it might be worth looking into how much you could trade it for.
It's not very likely that you will get back exactly what it's worth, but it may be an easy and quick way to make some money if you no longer want to keep it. Be sure to look online for reputable dealers.
Retro lunchboxes
We're reaching a little higher up the pay scale with this entry. Lunch boxes have been classy collector's items for years now since they're a perfect snapshot of the culture at the time of their release, featuring TV shows, rock bands, and celebrities, and they can turn out to be worth something wild if they're in good condition.
A vintage Bonanza lunch box brings in $130, and even a battered Beatles box can be worth about $400. Maybe keep some of your kid's plastic lunch boxes around, because who knows – one of them might be worth something.