expired Coolermaster Masterkeys Pro L RGB Mechanical Keyboard (Cherry Switch) Blue $133.2, Red $133.2, Brown $156 @ Warehouse1 eBay
Last edited 18/09/2017 - 10:24 by 1 other user
EDIT: Thanks to neosushi for the update on prices.
These seem like the cheapest (full size) Cherry MX RGB keyboards, if that's what you've been looking for.
Warehouse1 have the Blue, Red and Brown listed for $145 on their site(Silver $153). If you live near their store, you could get it a few dollars cheaper (otherwise, the cost of postage makes eBay a better option).