Hey econobot, uhm They're a dime a dozen around here in the low countries. People use them as city bashers and grocery transportation and they often get thrown away if they only have two flats or if a spoke snapped and the wheel is slighly out of true. Got two wheels off one a few months ago because I couldn't bear to see one being dumped that easily.
But I have no deals on one sorry. But if he really wants one, I can have a look around. By the way, shipment to the US would be way more than whatever you would pay for one. They cost about 100 to 200 euros new, but i assume your friend is drooling over the vintage pre WW2 old old old school ones?