Aukey Rainbow Backlit Wired USB Mechanical Keyboards w/ Outemu Blue Switches is on sale from $24.74 after promotion codes listed below. Shipping is always free w/ Prime or on orders of $25 or more.
There are actually two options:
Don’t have Amazon Prime?
You can sign up for a Free 30 Day Free Trial Here
Better yet, if you’re a student you can sign up for a Free 6 Month Trial Here