I bought the Canon 15-85mm from DigitalRev through Ebay. By far the best price and I have to say the best communication and service I've ever had.
It was a Friday - I had the weekend off and really needed the lens (honest guv!) I sent them a message on one of the buy it now auctions asking if they could get it out super quick, they said 'yes' the lens is in the UK and ready to be shipped.
Sure enough, I paid for the lens around lunchtime on the Friday and it came next day delivery on the Saturday morning!! (there was no extra cost for the weekend delivery)
So for me they get a big thumbs up!
Regards
Neil