Woot offers Hallmark Paper Wonder Valentines Day Pop Up Cards, Hearts (Pack of 8 Cards and Envelopes) for $2.39 (orig. $15.99) + free shipping with Prime.

Product Description:
Make it easy for adults and kids alike to celebrate with this pack of pop up Valentine's Day cards. With a 3D colorful hearts design, there's room to write a short-and-sweet message on the back to your favorite people. Classmates, colleagues, friends, and family are sure to appreciate a simple note as they celebrate the ones they love the most. The Hallmark brand is widely recognized as the very best for greeting cards, gift wrap, and more. For more than 100 years, Hallmark has been helping its customers make everyday moments more beautiful and celebrations more joyful.
 

• Send a little love to all your favorite people with this boxed set of festive 3D Valentines pop up cards.
• Valentine cards pop up into a 3D display of shooting pastel hearts, with "Happy Valentine's Day" lettering. Back of card includes space for a brief message.
• Buy in bulk to send a Valentine to even more friends and family.
• Valentines card pack contains 8 cards and envelopes. Cards measure 5" x 7.2".
• Printed on high quality paper stock, Hallmark's eco-friendly greeting cards are made with paper from well-managed forests.