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unpowered switches are on the restricted parts list as any amount, any type. So you can go to your local electronics store and get as many as you like without it counting in the $200 electronics budget.
100k linear taper potentiometers are also on the restricted parts list as any amount.
You can use other switches or potentiometers, but you would need to buy them from digikey or FAI and they would count as part of the $200. You would also likely need to interface circuitry to get them to interface cleanly with the control system.
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