dare i say usable, decent and alloy? they don't have to be retro either they'll be put on the b.v. most of the time and i cannot remember what speed cassette it's running (it's stashed at me dad's 300 miles away) not very helpful but it's been one of those weeks!
Regarding swapsies not limited to wheels, will consider most things, maybe a posties' bike
ON EBAY