Like lumbago said, most Roland synths and modules (or any synth that says "General Midi" or "GS" on it) will have a piano #004 which is a Honky Tonk piano and sounds like what you're talking about. A little eq might help.
All Mac computers running OS X have that sound built in too, although it's not great, but they licensed it from Roland, and it might even work.
It sounds like the intro to "O-Bla-Di, O-Bla-Da" if you know that.