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Campana will definitely help your stolen bases.
Unlike saves, you can find guys who are racking up steals on the waiver wire. If you don't feel like trading any of your players or you're waiting for one of your speed demons to finally start producing (cough, Cameron Maybin and Coco Crisp, cough), then look to the wire.
Here are a few guys who are capable of boosting your stolen base department that are most likely available (the percent owned is based off Yahoo! leagues):
Gerardo Parra (10 percent owned): He's started all 19 games for the D-backs and he's swiped five bases.
Tony Campana (3 percent owned): He's started the last five games for the Cubs and he's stolen four bases. He's an immediate impact in the running game. He should get the majority of starts against righties.
Jose Altuve (46 percent owned): He's absolutely on fire right now. The more he gets on base, the more he'll have a chance to steal. He has four steals so far.
Alcides Escobar (29 percent owned): The Royals are struggling, but Escobar has been consistent. He has four stolen bases to go with his .303 average.
Denard Span (20 percent owned): Span has three steals this season. His OBP is at .373, so as long as he's getting on base, he'll run on the base paths.