Schering stopped producing primo tabs in like 97/98. Are you saying that they started production of them again? Also, when primo tabs were being produced legit they ran about $2/tab, so I'd be skeptical on getting them at 50 cents per tab.
But, if they are legit and only cost 50 cents per tab they would work great for bridging. I used to use them to bridge. Drop me an email when you get a chance.