My sentiment as well. Giancarlo Stanton is 27 years old. The contract for the next 5 years, at $29.5 million/year as I understand it, is actually pretty good. The contract for the 5 years after that, covering his mid-30s, is a huge gamble. If he's still an offensive force, great. But chances are his skills diminish and the contract cripples the Red Sox. So if Stanton were just offered without anything returning in trade, the Sox should probably still say no. But to add prospects into the mix, it just makes it so much more likely the trade will not be in the Sox's favor.
That said, I would love to see him in a Sox uniform. But the only way to reduce the risk involved in this trade is to include David Price's contract. So, I would do Stanton for Price, but why would the Marlins? They want prospects.