Hmm, looking into it further, I see that they also offer the V-drum system with plain old rubber pads...

http://www.musiciansfriend.com/srs7/g=home/search/detail/base_pid/442370/

Wouldn't be quite the same as the natural heads...

http://www.musiciansfriend.com/srs7/search/g=home/detail/base_id/40974/

... but would probably still work well.
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Tony Fabris