Likewise, I've just today received this same lens after much hunting around for prices, and I bought it from the exact same link posted above, from "trustsaleuk" on Ebay. Ordered Monday night, arrived this (Thursday) morning - not bad at all!
Seems in top condition, and that's the best price I could find (with a 1-year seller warranty). There are others on Ebay for £10 less, but the warranty is only 3 months. Could have been a refurb - if mine is I certainly can't tell - but decided to take the chance anyway. Heard some horror stories about ordering through Simply Electronics (who are selling via Amazon.co.uk), so avoided that option. Next choice was Kerso but unfortunately his price was quite a bit higher, though there would have been no risk there.
For the price, I think that either this lens or the Sigma 70-300mm DG APO Macro are the best choices, though the Sigma has no IS.
I sacrificed the extra 50mm for that 4-stop IS - glad I did too! I took a handheld test shot at 1/3 second earlier, at 250mm, and it came out not far from pin-sharp, much to my surprise!
