For those patient enough to not import one, Amazon is finally taking preorders on the rumbletastic DualShock 3, which is due out on April 15th (the same day as GT5 Prologue). We've been keeping busy with an import model and it's a worthwhile upgrade. Besides the rumble, it has a seemingly better Bluetooth transmitter and tweaked R2/L2 triggers.
Even better, Amazon is pre-selling it for the same price as the Sixaxis ($49.99) and includes free super saver shipping. Check it out, here.