For UK users:
If you are on a tight budget Amazon UK are selling the Corel VideoStudio Pro X4 Ultimate edition for £21 at the moment. This includes the proDAD Mercalli 2.0.92 plug-in. It works great - I've run some really bad footage through it and then exported it as DV-AVI for use in PRE.
OK - it's an extra workflow step and an extra application to install but at £21 it's a cheap way to get what looks like the full plug-in.
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Thanks for the tip, Neale!