Those look like standard reciprocating saw blades- should be easy enough to find just about anywhere, but be warned, the tooth pattern on power saw blades can be a little too aggressive for manual use sometimes.Great find! Def
I saw something very similar in Lee Valley catalog ( http://www.leevalley.com/wood/page.aspx?c=1&p=62596&cat=1,43411,43417 ). In their case though, I suspect the whole thing is made in China.(Image removed from quote.)