200 Gems or 
575 Favor
Follow SMITE on their Official Twitter page by following this promo link.
400 Gems
400 Gems (Musketeer Chest)
Redeemed through skin code. (Very Rare)
200 Gems or 9500 Favor at God Mastery 1
300 Gems or 12500 Favor at God Mastery 5
400 Gems or 15000 Favor at God Mastery 10