I'm currently having some issues getting in touch with DualMiner and their website also seems to show limited/out of stock for the DualMiner USBs. :/
Unfortunately it looks like things are going to be a bit delayed- as for now I don't have an ETA but will post here as soon as I hear back.

I apologize for the delays and hope everyone who ordered in the first batch who has received their miners are enjoying them!  I know there are still international orders that have not been delivered but it looks like the first few orders to Europe have been delivered today so everyone should be receiving their miners soon.