You can't get a lefty Fender P-Bass! Not in the model you are looking for, most likely. The Invalid Link Removed shows 25 models of P-Bass available right now. After you filter the results for orientation, you can find one (1) lefty model available from Fender, an Invalid Link Removed with no apparent options of any kind available for $1349.99 at the time of this post. Which is fine if you want an alder body, maple neck, rosewood fingerboard, pearloid dots, chrome hardware (I do like the bridge), etc... but if you want anything else, your options consist of buying the bass and then spending more money and modifying it.
Or you could get exactly all the features you want on a Warmoth bass. Whereas a whopping 4% of Fender's P-Bass offerings are lefty friendly, there are no limits at all to what a lefty can order from Warmoth. And they don't charge a penny more for lefty stuff. I just checked the price on having a lefty body and neck built -- alder lefty P body in gloss black for $380, lefty maple P neck with rosewood fretboard, MOP dots, jumbo nickle frets, black TUSQ nut, and clear gloss finish, for $325. That's $705, plus shipping (and tax if you are in Washington). That leaves about $600 to buy whatever strings you want, whatever pickup you want, whatever hardware you want -- and if you don't feel like putting it together yourself, you have enough left over to pay a luthier to do it.
The Warmoth price starts going up a bit if you want different options, like a mahogany body or an ebony fretboard, but those kinds of options aren't even available at Fender -- unless you talk to the Custom Shop, but then you're not talking about a ~$1500 price range any more.
Sorry about the off topic rant. I just felt that question needed to be addressed, even though it' a zombie question.