It was only a matter of time, but we thought it would be a little more time than this. Expansys is following in Clove's footsteps today and has just put up the HTC One for pre-order at the cool price of £519. Both silver and black varieties are available, but only in 32GB capacity (as expected). The pricing looks about the same to what Clove is offering the One for SIM free in the U.K. also.
Expansys also has pre-order placeholders ready to sell to U.S. customers, with both colors and capacities available, but there isn't any pricing information just quite yet. Three of the four major carriers in the U.S. have announced availability as well, so it looks like folks stateside will have several options when it comes to buying this device.