Pozi #3 at the Orange Big Box

Finding pozi drive #3 bits hasn't easy. Mail order kills with shipping costs. Not sure that every store has them but my local Home Depot has two drive tool sets with a driver and assortment of bits including the Pozi #3 and the T10 Torx bit needed for Dynafit Bindings. For a longer #3 to use on the front binding screw, my local garage ordered a 3 1/2 bit from Snap-on tools for 7 bucks.

Harbor Freight has a #3 pozi in some of their sets as well, and as with all Harbor Freight tools they are inexpensive. I'm assuming based on your reference to shipping costs, you are familiar with www.wihatools.com , in the past to make the cost of the shipping a little more palatable I've put together a group order, just a thought.

Hardwick's on Roosevelt has some too, including just the bit which you can use in a drill motor. Pretty handy.

Best hardware store ever.

Black and Decker store at the North Bend outlet mall often has them. Also widely available in Europe if you happen to be going or have folks visiting from there.