Amazon offers Prime members the DC Comics Batman Tunnel Takedown 4" Figure 7-Pack
with free shipping
. (Non-members can spend $35 or more to qualify for free shipping; otherwise, shipping costs $6.41.) That's the lowest total price we could find by $22. It includes Red Robin, Nightwing, Two-Face, The Joker, oversized Solomon Grundy, and two versions of Batman.
Orders placed via Prime by December 22 are guaranteed to arrive in time for Christmas. (The deadline for standard shipping is December 19.)