With thanks to NeoGAF for finding the information:
http://www.amazon.com/exec/obidos/ASIN/B00213JM9O/
WiiWare games can now be bought on Amazon. I think it's a bloody brilliant way to promote the service to people who wouldn't know what the Wii Shop is, let alone care to find it. Well done, Nintendo: well done. Now bring over the other games! (And VC too)