Originally Posted by farfisa 
They'll probably take $270, so I'd start with an offer. Less than half of the DA*16-50.
Prodigital accepted my offer of $270 US for the 17-50, so you should be good to go. I think their rule of thumb is generally 10% off the listed price. I used a 15% ebay/paypal coupon as well, so it was a nice deal (under $250, including shipping to the US). I got mine yesterday--it's a very nice lens, very much like my Tamron 28-75, but more compact and lighter.