Groupon offers a voucher for a Printerpix 11-oz. Magic Photo Mug for $5. Shipping at Printerpix adds $5.99. That's a savings of $30 and the lowest total price we could find. These mugs feature a black heat-sensitive coating that reveals a photo when the contents are warm.

Buying more than one? Note that you can get two mugs for $8 ($4 each), three mugs for $12 ($4 each), four mugs for $15 ($3.75 each), five mugs for $20 ($4 each), or 10 mugs for $35 ($3.50 each). Shipping for multiple quantities starts at $9.98.