How high should my stock be on Tulowitzki? I have a guy in my league who has been offering me 3 trades a day.

You offer him something that you want but that he will reject. Say if he rejects you are not trading him so if he says no just do not bother with looking at his trade offers but if he accepts it you will get a better guy. Tulo has three long already in Spring Training so trade for his best hitter.