I picked up this Sirius Sportster Radio (model SP-B1A) on the SECOND DAY of a local estate sale for JUST $5 and it sells on eBay for $75+! It MIGHT have a LIFETIME subscription included that would raise it's value to $150+.
Now I have to decide if I keep it or sell it.
Similar lessons as usual: Don't assume that all of the 'good stuff' will be gone by day two of an estate sale. Look for things that stand out because you have not seen them before. Then, use the apps on your phone to identify items and check their values online. It's not complicated.