Kmart Deal: Post Cereals As Low As $.50!! Posted on August 13, 2012 by Kitty Stock up on Cereal with this deal at Kmart!! Post Cereals, selected varieties 2/$5 Less: $1/2 Printable OR $1/2 Mfg. Coupon (SS 7/22) OR $1/1 Printable Final Price: as low as .50 cents wyb1 and your store doubles!!