Got the last two at Wally World, any office supply store will have it. Comes in packages just like regular printer paper, just not so many sheets. Where regular printer paper is 20 or 24 pound, the card stock is 110 pound. About the same stuff that's used for business cards. As to how my printer handles it, the targets I posted for the Shootout were on the same card stock. I don't remember what the specs are on my printer, but I know it will handle stock even heavier than this.
Those poker chips sound like a lot of fun, where'd you ever find them? And what type are they, the nice clay type, or the typical plastic? Either way, sounds like it could get messy...
Dave