Walmart offers the Gear4 Angry Birds Portable Speaker with Subwoofer and Bass Control, model no. PG776G, for $18. Choose Site-to-Store pickup to avoid the $4.97 shipping fee. That's the lowest price we could find by $12. It features 2.1-channel stereo sound, 30 watts of peak power handling, and a 3.5mm audio jack.
Orders placed by December 19 via standard shipping are guaranteed to arrive by Christmas.