Go here and enter
300993 for “Keyword of PubID” to request a free Star Collection bookmark. This freebie is 6×2 with rounded corner.
You might also be able to just copy and paste the link straight to it:
They only have a limited number of these to give away each day, but the stock refreshes after 24 hours. However, even if they show you a message saying they're out of stock, be sure to try checking out anyway! Earlier this week, they kept saying they were OOS and wouldn't let me checkout. Then today, I still got the OOS message, but the site let me checkout and they sent me a verification email. 🤷♂️
So YMMV and either way, if you miss out today, be sure to check back tomorrow!