It's no secret they're going to draft a QB with the 3rd pick. Therefore, they WANT to trade Garapolo. Clearly teams aren't falling all over themselves to get him. For one reason, he's going to bring a hefty contract along with an injury history and a mixed bag of performance.
Hard to tell how much they'll get for him. Might get a 1st, but I kind of doubt it. Niners got him for a 2nd, and that is probably what they'll sell him for.