Well if dirt cheap is your first priority..
I have seen this and I am thinking of buying one: http://www.sjscycles.co.uk/sl-tourne...k865-prod2044/
If you want to use panniers (and do not care about folding size or only use the rack once in a while) a full size could be fitted, maybe you need longer stays from the rack to the seatstays on the bike http://www.sjscycles.co.uk/rack-spares-dept964_pg1/ .
You could be lucky and find one of the Dahon racks could fit. Best is if you can find a shop that sell them or at least a Dahon 20" bike with a rack to compare with.
°Empty drums make a lot of noice... (Old Hungarian proverb).
It's not my priority, but it seems pretty good value for the money. Thanks for the links.
Ideally, I'd like to get a rear rack + bag (lighter than metal panier) that is confirmed to be Dahon-compatible.
There are several brands/models for rear racks:
Dahon Tour Rear Rack
Aluminum rear rack 20
DAHON Traveller Rear Rack
Bike Friday's comes off and folds flat when packing is needed.
Any bag should work, if you pay attention to heel strike issues, any bag would have to be removed to fold.
Bike Friday NWT (coming soon)
1970s (or 80s) fuji touring with a Yakima Big Tow
2008 Surly LHT with Axiom Racks and SKS Fenders (for sale)
Mid 80's Cannondale Road Bike
You may be better with a rack on the front to give a better center of mass, the added benefit is having anything you're carrying in view. There are plenty of racks designed to fit to V brake bosses and fork crown.
They have similar frame bikes with racks http://www.oyama.eu/st-james.php , possibly they will sell you a spare part.
Happier than a camel on wednesday.
Thanks for the input. I'll measure things when the bike gets here and check which rear or front rack I can use.