They are on ebay here in the US.
The PSU is here :http://www.ebay.com/itm/Power-Supply-for-Blade-Erupter-Backplane-/181264277393?pt=LH_DefaultDomain_0&hash=item2a34315f91

The Backplane is here: http://www.ebay.com/itm/NEW-ASICMiner-Blade-Block-Erupter-Backplane-Bitcoin-/261331781129?pt=CPUs&hash=item3cd8968609

It may be cheaper then buying here. But I don't know for sure.