Moth
I've got almost a hundred gp.
I like the disguise Dave, Fist of Odin and Schmektor as Knights idea, but I also hear votes for my magnet idea. I don't think we've got the funds for getting a huge magnet, though.
One thing about the disguise idea though... I don't think the KoA take prisoners. I could be wrong, for example, the people trapped in the castle, but I've never known those knights to do anything but chainsaw and throw flames and cause bodily harm to people.
I think utilizing the lake, however we do it, is the most promising route.