The Staples has a website setup for this year's Invention Quest, which they say will be coming this Fall.

The Invention Quest contest is coming soon and Staples is looking for the next big thing! It can be the hottest office essential or a new, innovative organizational product, just as long as it makes work easier. This could be your year to win the $25,000 cash prize and have your inventions sold at Staples.

On the website you can enter your email address to get a reminder.  By the way, the winner will receive $25,000 plus royalties.