Lee Valley has these from Australia:
http://www.leevalley.com/us/wood/page.aspx?p=76547&cat=51&ap=1
Looks easy to make a toolpath for (but pricey)
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The simplest way to do those would be with a hand held router. It’d be done in seconds. You’d have to cobble up a 45 degree router base, but that’d be quick on a tablesaw.
But for a machine enclosure? SImple 90 degree butt joints. A bit of glue and a couple brads.