1. Buy larger cardstock, print multiples butt against each other, lay sheet on the material, trim to individual pieces.
2. Buy UV printer, print jig of multiple cards to fit printer, lay cardstock in jigs (outlines), print directly on multiple cards.
3. Fold back a 1/4" of wax paper, align with stock top edges, apply, fold back and remove wax paper, lay remaining, trim as needed (same as Johnny Best suggested).