Not only is the new Topps Shadow Stormtrooper card only available at StarWarsShop.com, you can only get it if you buy the new Shadow Scout Trooper with Speederbike.
You need to hurry though, as this offer only lasts two weeks (offer officially ends on August 15, 2007). Whilst the Shadow Scout is in-stock and ready to ship from StarWarsShop.com, the collector card gift will ship separately in approximately a month, at no additional charge/shipping fee! Remember that StarWarsShop.com do ship to the UK too.