none of the Windows Phone 7 devices will be available in Europe until October 21st, some of the European e-tailers/retailers have already started listing the unlocked, SIM-free devices. The first in line is the HTC's HD7, closely followed by the HTC 7 Trophy and LG's Optimus 7. Amazon.de
lists the HTC HD7 for a mere €599, and although the estimated arrival date is unknown, we guess that they could have it after the official October 21st date as HTC was pretty clear with the statement that these devices will first be delivered to carriers. This e-tailer also has LG's Optimus 7 for €499 on pre-order.
The UK based Amazon and Expansys have listed HTC's 7 Trophy device for £429.99 and these have an estimated delivery date set to November 8th.