Diptronics DTS-21N-V 4.3mm Rnd 12 x 12 Tactile Switch

Diptronics-Miniature-12-x-12-Tactile-Switches-Diptronics-DTS-21N-V-p-Miniature-12-x-12mm-PCB-mounted-tactile-switch-from-Diptronics-p-Diptronics-DTS-21N-V-4-3mm-Rnd-12-x-12-Tactile-Switch

Price: 0.40 from Rapid Online Rapid Electronics Ltd.