Keep an eye on ebay and do wide searches.
I scored a brand new set of tandem wheels off a new Cannondale for $100 because nobody else bid on them. They weren't listed correctly as "tandem" wheels. I knew they were by the hub part numbers and number of spokes.
Last year I saw several brand new wheel sets go for as low as $75.00 to$125.00 , these were older 140mm width. New old stock.