Logitech K840 - $3.50....Every key works except one, but that's fine by me!!! : r/MechanicalKeyboards
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Logitech K840 Review - RTINGS.com
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Experience mechanical keyboards for less w/ Logitech's K840: $41 (Refurb, Orig. $75)
Review: Logitech's K840 is an affordable gateway to mechanical keyboards
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Found this beauty at a thrift store today for $3.99! Logitech K840 Mechanical Keyboard! : r/MechanicalKeyboards
Logitech K840 Romer-G Review
Logitech unveils K840 Mechanical Keyboard for non-gamers | BetaNews
Logitech K840 Romer-G Review
Best Buy: Logitech K840 Mechanical USB Keyboard Black/gray 920-008350
