PopCap Games cuts 50% off a selection of its downloadable games for Windows and Mac during its Happy Merry Sale. That drops many to $9.95. It's tied with our March mention as the best sale we've seen from PopCap this year. Notable games include Bejeweled 3, Plants vs. Zombies, Chuzzle, Bookworm, and more. Some exclusions apply. Sale ends January 3.