User blog comment:Argorrath/CoD Devs confirms Extinction DLC for future/@comment-89.100.49.34-20131216133007/@comment-71.194.87.135-20131217232518

I figured since map packs are $15 USD, and based off of nuketown zombies which is $5, i can make a hypothesis that multiplayer maps are $2.50 and zombie maps are $5.00.