I have been using these business cards as price tags for a while. I just got these new ones from Vistaprint and did vertical ones instead of the horizontal size.
I just used a standard design and on the back added a $ symbol so all I have to do is write in the price. The card overall is very blank so I have room to add text or descriptions as necessary.
I also can use them for things like these new kanzashi brooches, just add holes and pin onto the card.
Handy and low cost add your own ribbon, yarn, hemp, twine to loop onto purses or totes or whatever.