A review for Circle stickers by Copyfree Initiative.
These stickers are exactly what I wanted/expected, and they arrived ahead of the estimated schedule. I re-ordered (a larger order this time), and it too appears to be on track to arrive several days ahead of schedule. They look good, they seem sturdy, and the price is good, too. The only real problem I have so far -- and it's fairly minor -- is the fact there are no cuts in the backing or other tricks to make it easier to peel the backing off the sticker when I want to stick it on something.
Of course, I do not know how much the sticker might fade over time. It has only been a bit more than a week.