Play.com have Acheron for £7.99 or they did anyway and I think that you can pre order the mass market paperback thats out in December for about a fiver. I noticed it after I bought my copy. you must read it, it actually lived up to my expectations. So not swapping my copy.
I still bitterly regret that I swapped fantasy lover what was I thinking that book was great.
I have a Kinley McGregor on swaps btw if anyone is interested. Knights of Avalon doesn't live up to her dark hunters but is ok.