I ordered one from Hypershop in California on 13th April and had it delivered to sunny Lancashire by FedEx on the 16th! It cost me the equivalent of £83.27 (inc. post and packing) but you could get it cheaper if you were prepared to wait a bit longer for delivery.
It has so far proved to be a fantastic piece of kit and fulfilled everything I could have wished for it. I have tried it with USB keys of all sizes as well as a variety of external hard drives. I have been able to send photographs directly to and from my iPad and stream movies and MP3's from one room to another! The only problem I had from the outset was the rather scant instructions provided. As a result It took me quite some time to get the hang of operating it. I have voiced my concerns with the supplier and am awaiting their reply. However, with a little technical nouse and reference to the review on YouTube which can be found by searching for CloudFTP and looking for the video uploaded by zyzienzergling, you should be able to figure it out.
It'll just be my luck though if Apple open up the Camera Connection Kit to bi-directional file transfer in which case there'd be no need to buy the CloudFTP. Can't see that happening in the short term however, fingers crossed!