I got my front-right arm suspension bush replaced for £20 + labour if I remember right, had this done October 2009. The thing was cracking and allowing too much movement, possibly as a result of a mismatched tyre size on one side of the coupe.
Had trouble getting hold of the rubber bush on it's own, the official Fiat part includes the arm as well which could cost £110 + labour.
Pays to keep an eye on them as mine failed me the MOT. Not hard to remedy tho.