Groupon is selling 21200 Life of George and 3874 Heroica Ilrion bundled together for $29.99 plus tax. Perhaps not really exciting sets, but it comes to 42% or about 7.8 cents per piece.
If you're new to Groupon, please follow this link (I get rewards from Groupon for referrals): http://www.groupon.com//raf/UserReferral_rp/121015/10r1act/lk/uu40387927
Once you're on the Groupon site, click on "Goods" at the top, as the deal is listed in that section. If you have trouble finding it, here's a direct link: http://www.groupon.com/deals/gg-lego-games-bundle