Amazon offers Prime members the Nerf Rebelle Rapid Red Blaster
, model no. A8920F01, for $13.97
with free shipping
. (Non-members can spend $35 or more to qualify for free shipping; otherwise, it adds $6.59.) That's the lowest total price we could find by $3. It fires darts up to 75 feet and features a 12-dart clip which decodes messages, six collectible darts, and six message darts.
Orders placed via Prime by December 22 are guaranteed to arrive in time for Christmas. (The deadline for standard shipping is December 19.)