The marbles I sell come from my personal collection and are being sold to make room for new ones - I don't buy glass just to mark up 3x and resell. I consider these art.
Legos I sell are brand new, sealed, and in mint condition unless otherwise stated or shown in the pictures. My used sets are from my personal collection and have been kept in storage except for when they are built. They are some of the cleanest used sets you will find anywhere.
Squishmallows come from my wife's collection. She keeps them in a large squish closet and as such are perfectly new & unused, smoke free, un-snuggled, etc.