make it yourself? it's not hard
Save a "Take Your Heart" pic to your PC and upload it to a site that does custom designs (Custom Ink, Teespring, etc.)
it may not be exactly what you're looking for, but Eighty Sixed has a really nice P5 poster design
The true solution is to kidnap Yusuke and force him to make you one.
I’ve tried that 2 weeks ago and he still won’t do it...
You just need to threaten to destroy the Sayouri (Or what ever the heck it’s called.) and maybe he’ll do it.
Never mind, after that comment was made he replaced it with a fake...