The full list of items:
Memo pad
Charm pen
Pencil case
Sketchbook set
Study set
Sticker roll
Dry erase board
Jumbo pencil
Jumbo eraser
Tattoos
Pencil with two toppers
Pen and notebook set
I saw the dry erase board at the first Walmart where I found the dollar items and haven't seen it since. I finally tracked down a couple Sketchbook sets, but I still can't find the Twilight Sparkle notebook and pen set.
Most stores had the bins at the front of the store and a couple had them near the cards and party supplies, but there have also been several that I could find no sign of them having any Dollar Stations at all.