Board Thread:General Discussion/@comment-4995895-20130128063746/@comment-5792287-20130129090856

How about this selection to render your Metal-using Zombies useless:

Fume-shroom, Coffee Bean, Wall-nut, Magnet-shroom and Squash.

Fumes are more expensive but far more useful, and with the Magnets, you wouldn't need many instants. Wall-nuts cut cost and you don't need Tall-nuts because of the Magnets dealing with Pogos.