CNBC started a new round of the Million Dollar Portfolio Challenge this week. Participants get to play with a million dollars of CNBC bucks in an effort to win weekly prizes and a Grand Prize of $500,000. If you have ever wanted to play the stock market and see if you could make big bucks, this is your chance to jump in without risking a penny.

HGTV has started a new contest in conjunction with Season Three of the Design Star series. The Grand Prize is a $5000 shopping spree from Sears and a $5000 Gift Card from Lumber Liquidators. You can enter once a day until August 4th.

HGTV also has an ongoing Product of the Day contest with weekly winners. The contest features a new tool or construction product every day.