I too got mine at my local TSC but they had a couple of different choices. One of the ones was about the size of a fist and built like a cage (more for lettuce and larger treats), with a bell on the bottom, like this.
but there are others out there too. This one looks great for nuts and seeds...
Welcome Cats and Chicks! Bedding, as you can see, is a hot topic around here. I'm fairly new myself so I'm no expert but I can tell you what I've experienced. I too have a small coop (see my profile picture) and use shavings. My girls come out during the day but my husband has been in the...