Happy Halloweenies $20.00 Inside Message Blank Inside Packages of Heartstrings® cards are shrink-wrapped and sold in sets of 10 cards with envelopes. The actual card size is 4 1/4" x 5 1/2". Happy Halloweenies quantity Add to cart SKU: 1165. Category: Misc Occasions. Related Products Cranberries are like a family strung together $20.00 Tie your cape, floss your fangs, be nice to other ghouls $20.00 A New Adventure $20.00 Vant to Ride? $20.00