Here's the response I received today: Hi, Thank you for visiting and for your interest in POST, Oat Flakes.
I haven't found its equal, but if there's a Trader Joe's near you try their Toasted Oatmeal Flakes.
I even tried to find a contact us spot to request them on the Post website, but no luck I'd GIVE anything for a room full!
The closest I've found are at Whole Foods (and some other similar stores) and come in a large green and clear bag, but they're grainier than FOFs.
It was maybe a 6 oz box covered in shiny foil and had tiny flakes.