New Post Rebate Offer This post may contain affiliate links. Please see the full disclosure policy here. Posted on November 6, 2009 Written by Mary Leave a Comment Kellie just emailed me about this new rebate offer. Buy 2 specially marked Post cereals and get $4 back when you buy Night at the Museum: Battle of the Smithsonian. Keep an eye out for Post Cereal boxes with the offer on the box! Thanks, Kellie at Crazy Clippers!