The Vikings are putting Percy Harvin up for trade! I read it here http://www.nfl.com/news/story/0ap1000000137929/article/report-vikings-will-actively-pursue-percy-harvin-trade on NFL.com. The article says that a trade would likely be for just a 2nd or 3rd round pick, but just like Revis, a contract extension would have to be made.
Harvin's likely salary would be around $10 million a year. This would solve the slot WR, KR, PR and would add versatility to the backfield. Imagine the Bucs offense with VJ, Mike Williams, Harvin, Martin, and whatever TE the Bucs end up getting. Along with a healthy O-line the Bucs could have a top tier offense. A 3rd round pick isn't too much to give away for a top NFL WR.