A pack of 4 miniature pcb edge surface mount toggle slide switches. Just $1.60 a pack.
Single pole, Double Throw (a "2 way switch", A-Common-B ).
These are very small switches (see photo with switch on the tip of my little finger), good for A or B mode type inputs to a microcontroller, or an on/off soft-switch driving a MOSFET to switch the full juice (current capacity of the switch itself is unknown and won't be much I expect).
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