Just tried to place order and got this instead:
"Unfortunately, these items are not available. They may have been purchased already or the item listing has expired."
Update: Yeh, now I see it was actually caused by their change on quantity limit. I put 4 there and during the check out they probably decreased the limit so I can't finish the check out. Go back and try to add 4 card again and see "limit 1 per account". Have to accept that and then went through without problem.
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