Look on craigslist, audiogon or variuos HT forums, sometimes you luck into a deal. One just sold on Polks Flea Market (which is a hookup site for members that sell to each other), 1 yr old, $250. That's lower than I've ever seen them, but I have seen them from $300-350. Also, you can call Erik and put yourself on the B-stock list. You'll have better luck than just using the site.
That S12 from Vann's for $400 is another great deal. It's probably comparable, the numbers are very good. I just can't imagine the PB10 not being a bit better or even a lot better.