I'm fairly certain that the guy who made that particular blade in your bottom pic was called "Mega" and ran an online horror movie prop reproduction site called East Coast Studio 1 up until early 2007.
They were generally produced from a hard aluminum alloy (custom versions were made from spring steel) and were meant to replicate the oversized machetes used in the movie "Freddy Vs. Jason".
They originally sold for $160.00.
There were several prop makers producing them at the time, some better than others but that looks exactly like one from ECS1, which were considered worldwide to be the most accurate to the film used blades. <img src="/ubbthreads/images/graemlins/wink.gif" alt="" />