A dollar a piece at local junk store. the same place I bought my first fatboy @ for $2.50 Two injectors (one is adjustable) A fatboy w/ case instructions and a few blades. he he.
This is the kind of thing that depresses those of us who got most of their vintage razors on eBay. And I do check junk stores, thrift shops, antique stores, flea markets, yard sales . . . just never find anything.
Okay someone did give me a Schick adjustable for nothing, but that was after I'd bought another one from someone else for $29, so you're still way ahead on average.
As a public service you should keep going to these junk shops and picking up these underappreciated items. And then move them to a more appreciative market.