KS-3 Gateron Red 5-pin switches are a great cheap linear switch. Featuring a black nylon top and bottom housing, along with a red POM stem.
Price includes:
10x switches
(10x lubing) depending on your choice
Type: Linear
Actuation: ~0.44N / 45g
Bottom-out: ~0.54N / 55g
Pre-travel: 2mm
Total travel: 4mm