Thing is...we spent (allegedly) 8-9 million on a striker in January.
None of our rivals are going to sell their players on the cheap anyway; even more so when they are aware of how much we've been willing to spend in the past.
Generally speaking we've brought in players from the likes of Watford, Burnley etc who have been looking to move these players on. That's not to say they are bad players (far from it), but you don't snap up a player like Nando for 3 or so million if Watford are desperate to keep hold. Hooper is another one. Very good player, but Norwich were looking to get rid.