While Stampin' Up! is releasing just one Best of stamp set per month, all of the Best of sets will be available until March 31, 2014. (But you don't want to wait THAT long!!)
As a special incentive to collect the Best of stamps, included will be a collector's card and 25-year proof of purchase sticker with every Best of set. Collect six stickers, and send it in to redeem a FREE set of your choice valued up to $14.95! Free sets must be redeemed no later than April 30, 2014.