They aren't as common as in the NBA or MLB, but trades do happen in the National Football League.
In fact, just last week the Oakland Raiders dealt a sixth-round pick to the Houston Texans for quarterback Matt Schaub, in a deal that led Oakland head coach Dennis Allen to tell reporters (via Tim Kawakami of The San Francisco Chronicle), "We have a quarterback now that’s on par with the quarterbacks in this division."
Of course, the flip side of Schaub's arrival is Terrelle Pryor, who started nine games for the Raiders last year, being left out in the cold. Sure enough, the fourth-year pro has reportedly requested a trade, per Scott Bair of CSNBayArea.com.
Then there are other players who don't have to be asked. Sometimes it's a personnel decision, and other times a financial one, but in just the past week or so a pair of $10 million wideouts have been put on the block.
Or not, depending on who you ask.
Here's a look at the latest on each of those players and more, from Pryor and those high-priced pass-catchers to a 2,000-yard tailback and a Pro Bowler up front.