Why spend a ton of money on card bases when you can purchase a pack of card stock 110bs. I take mine to Staples and for about $10 they can cut the paper so that it is 4 x 5 1/2 so that would be 500 bases.
$11.45 + $10 subtotal $21.45/500 each base would be four cents each.
I have bought the 50 pack from the store for $10.00 those are twenty-one cents each. We suggest the card stock the right.. click the image to learn more.