We've seen ads for the HTC Titan and Radar over at Amazon.com's UK site and now we are seeing the HTC Radar make an appearance on the UK mobile phone site, IntoMobilePhones. While there isn't an out of contract price listed for the Radar, the monthly rental is running 26.88 Pounds (about $44 U.S.). The out of contract price, while not listed, has been reported to be $568 U.S on the Amazon.com listing.
The interesting part of the advertisement is the availability date. The Radar is currently being offered as a pre-order with stock expected around September 20th.
If true, the Radar will be available long before the "first of October" date we heard at the London unveiling. There is a double asterix after the date which likely means "give or take a few weeks" just in case supplies are delayed.