One link (in Germany) http://www.laukhuff.de/ has a
foldable MIDI pedalboard (appr. 700 USD). A nonfoldable but with half
the price has http://www.organsuzuki.com (in Sweden)(appr. 650 USD).
Even
cheaper than that will the one that I´m just starting to put
together - after a year of research for the proper MIDI-interface-
circuit, a used pedalboard from a teared down old church organ,
cables, 30 special contacts reacting in magnetic fields, 30 small
magnets, 30 diods. Just about 200 US dollar. If anyone knows about
such a thing possible to buy in US, please let the group know,
because it is a very handy and cheap alternative for home practising
combined with one or two synthetizers.

Greetings