Cheap air valves or solenoids?
I'm planning on building an unconventional pipe organ, but I am having trouble finding good cheap air valves that I can buy 60 of to complete an entire manual (keyboard).
Normally, a classic organ would use mechanical linkages to a sort of air switchboard, but I have neither the time nor the inclination to build that kind of system (and I want everything to be physically robust and portable, for traveling and abuse during performances. Plus my pipes are very weird ones, and almost all of them would have to be offset anyway, so air tubes would be involved at some point no matter what.)
So I'd prefer to have air lines going to each key, with a valve, and then the air lines continue to a much simpler switchboard, so that no pulleys or levers need to be involved.
The valves can be electric (keys can easily connect a circuit instead of letting air through), or mechanical (pressing the key opens the valve), and my budget is about 2 dollars or less per valve. Any ideas or links? Homemade plans are welcome too, if you have a method that would be easy to mass produce and not cause leakage.
Some of the lower notes may require higher airflow/larger valves too, so a solution that is scalable is preferred.