I have done (and shared) this layout before. I had to do it again, though because it is just so dang quick an easy!!! Check it out:
Step 1: Score Whisper White card stock at 3”, 5 ½” and 8” (LOVE using the new Simply Scored tool for making 20 of this project!):
Step 2: Turn sheet over and apply sticky strip (or snail) as shown, making sure to place the adhesive as close to the edges as possible. If too much space is left there will not be enough room for your gift card to slide in.
Step 3: Tape together and use Word Window punch to punch out a slot on the seam.
Continue punching along the seam until the opening is wide enough for your gift card to fit.
Step 4: Use your ¾” circle punch to punch out a semi-circle in the middle and decorate as desired:
Easy! Here is the Santa gift card holder I made a few years ago - same instruction, different decoration on the front:
Have a fun day :)