I know a couple of people were looking for good Fami to NES and vice versa converters. I just checked and robwebb has both adapters for a very affordable price. I ordered the NES fo Famicom adapter and it works really well.
http://www.consolegoods.co.uk/ (http://www.consolegoods.co.uk/)
Just thought I'd let you guys know... :)
Good prices for those in Europe.