[drcy]

Also, supplements are included with the product (an unattached blank back print or postcard included with a publication, though not a bound part of it), while a premium is something you send away for (and costs something such as coupons or $$). Baseball Magazine Premiums are premiums rather than supplements because you had to mail away to get them, while Police Gazette Supplements are supplements because they were included with magazines. Old Judge Cabinets are premiums because you got them by mailing in coupons.

There will be some borderline supplements, such as a page bound in a magazine that was clearly designed to be removed. There were a few blank bank prints bound in Baseball Magazine magazines that were designed to be removed by the reader. These aren't the same as the normal magazine page or picture, though they were bound with the rest of the pages. A clear example would be the Sports Illustrated for Kids cards that were staple bound in the magazine but were more than clearly intended to be removed as trading cards. They're even on cardboard with perforated edges.

If the publisher clearly intended for the reader to to remove and use a staple bound page as a pretty picture, then you can probably get away with it calling it a supplement. It's like cards cut from a newspaper. A newspaper picture isn't normally considered at trading card, but if they had dotted lines around them with pictures of scissors and has instructions for kids to cut them out as collectible cards, most would say they qualify as trading cards.