Twins May Target Wigginton
According to the Minneapolis Star-Tribune, the Twins may target Ty Wigginton of the Devil Rays as a third baseman and DH with some power. Wigginton makes less than $3MM and offers right-handed pop. The Twins are tenth in the league with a .393 SLG. They're even worse against southpaws, and Wigginton can definitely handle lefties.
Twins' 3Bs have hit .236/.319/.336, and the team's DHs have hit .256/.335/.365. These areas should both be fairly easy deadline upgrades. Minnesota is seven games out in the AL Central and 5.5 games out of the wild card.
Other potential cheap sources of DH power: Dmitri Young, Sammy Sosa, and Mike Sweeney.