Just bought my first lens for my EX-1, a Zonlai 25mm. It should be delivered in a few weeks (previous experiences of buying via ebay were perfect).
I did manage to bargain a few dollars of the price. Don't just pay the full fee, press the Make an offer button first. If the seller responds with a bid, just make a second offer. It could save a few dollars and the seller seems to like the effort, he was ever so friendly, when I asked if I could have the black version of the lens