Our local craft store many times has ArtBin on sale for $3.33. These are without the thread trays. I still use them for my thread, though. If you have lots of spools that are skinny spools (like Sulky) , they work for those. If lots of your spools are larger in diameter or even mini cones, the thread trays aren't as usable. I stack my spools in there and have certain colors in each one or specialty threads, like metallic or bobbin threads. A couple years ago, I bought a couple that had 2 thread trays in each one. Since then I've split up the trays so four ArtBins have one tray. I have 6 stacked on each other and they sort of lock together, but I can easily pick up several to get to one below. I like that they are translucent so you can see what colors are inside, but they are still protected from dust and sunlight.