There's a few Razo ones out there with Overdrive. I hate the autoshifter on the P5, it's so goddamn ugly. My buddy's automatic 323ci (well, semi-auto) has such a nice shift, and my Beetle had a nice short auto shiftknob too. The one on the P5 is so tall and skinny and ugly.
I looked but Razo doesn't seem to have a web page of their own. Neverthe less this page sells shifters for auto transmissions. 3 of them have overdrive buttons. The ones at the bottom are hella cool, but expensive.