Are you talking about legacy Commodore, Escom or Amiga Technologies Amiga goods - jeez, they're literally everywhere (many of it in landfills I surmise - yes, we're really just a silly and short sighted society we Americans)!!
But there's plenty of tangible goods left thanks to hoarders and those with somewhat of a vision to be discovered yet. Although I've never seen as much of this with Commodore as I have Atari. Promo stuff? Hardware? Software? Literature? Keychains? Mags? T-shirts? Bumper stickers? Coffee mugs? Hats? What is it you're looking for exactly? I've sold many of my duplicates, but probably have at least one of everything left above. Included many, many rare and exotic American Amiga mags and every issue of AmigaWorld and Amazing Computing ever published. I swear, there's literally a library of classic Amiga reads over here - maybe that's why some of this stuff seems (almost) current to me. lol
