WHY NOT MAKE YOUR OWN?
You can make your own cards by copying and pasting then printing on light cardboard folded once or a sheet of paper folded into fourths. Another idea is to glue one of your cards on the folded cardboard. If you want to be more creative you could use a cutout bug or fold a paper spring attached to a bug cutout folded inside. You also could cut four diagonal slits. One on each corner to hold your card in place. Along with the card, you might include some edible insects.
Have you thought of making your own "business" cards with an interesting bug?
There are sheets that you can put in your printer to make transfers for t-shirts.