I bet if you emailed them they would mail you one for free. I own a yoyo-string business (Big Yoyo String, like us on Facebook) and if people ask for stickers we send them some and they get some with orders as well
They sell them for 25 cents. A sticker that small, if they bought any quantity more than 250 should have cost about 0.03-0.05 CENTS, not dollars. We're talking half a penny here. I give out stickers that cost 7 cents each. I mean even if it cost the quarter like they are charging, why not give it out to people? It is advertising AND it may make them a future customer
I use the Lubix center stickers, but be warned that they're actually not exactly the same shade of white as the regular Dayan white stickers. It's slightly more eggshell.