The MSI Vigor GK50 Elite TKL mechanical gaming PC keyboard includes RGB lighting in a compact design. It's currently available on Amazon for a new all-time low price of only $33.30
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You can get the MSI Vigor GK20 backlit gaming keyboard for just $19.99 at Amazon. The Razer Ornata V3 keyboard is only $34.98 and the ROCCAT Vulcan Pro tactile optical keyboard is just $69.99.