We shouldn't have to tell you this, but don't buy or sell fake vaccination cards.
A sad truth in life is that if a document is important, someone will try to sell fake ones - even vaccination cards.
Believe it or not, there are people out there who would rather pay for a fake vaccine card than just get the vaccine for free. And fraudsters have popped up online trying to sell them. Aside from all the obvious reasons you shouldn't buy a fake vaccine card, remember that you'll be handing over personal information to someone who probably shouldn't be trusted.
Besides, the FBI is already on the lookout for vaccine scams, and invites citizens to report any to the Internet Crime Complaint Center at ic3.gov. Why would someone get a fake vaccine card anyway?