The USB versions are on sale currently here... I payed around 4 EURos for each
Only the Black/Red version though. The Blue one is sold out.
I am not really a fan of the new USB ones though since the buttons stick too much and the feeling is just not the same.... Also for some reason it seems there is a lag with WinUAE when playing games, its just a fraction of a second but I cannot play SuperFrog or Pinball Fantasies (with keyboard) on WinUAE. Can play it perfectly on the Real thing though.