20" (406) rim- source?

cpeachey
cpeachey Posts: 1,057
edited October 2009 in Road buying advice
I am looking for a rim for the folding tandem. 20" (406) 36 hole 18mm-20mm inside width.
Where can I buy one & what would be a good one?
The only one I have come up with so far is an Alex DM18 although I have not found a supplier yet.
Any help / suggestions please :?:
Chris