Kmart offers the Mega Bloks World of Warcraft Arthas & Sindragosa Playset, model no. 91008, for $12.60. Plus, Shop Your Way Max members bag free shipping. (Not a member? It's free to sign up for a 90-day trial; otherwise, shipping starts adds $6.99.) Outside of the price below, that's the lowest total price we could find by $6. This 150-piece set features a buildable Arthas micro action figure, buildable Sindragosa, and a buildable Frozen Throne.
Target offers the Mega Bloks Halo Collector's Edition Pack, model no. 97205, for $19.99. Coupon code "TGNVWY37" drops it to $14.99. With free shipping, that's the lowest total price we could find by $19. This 59-piece set includes eight weapons.