Roccat's Vulcan 121 full-size mechanical keyboard is down to $48 in the US
Roccat makes some good mechanical keyboards, especially their Vulcan line which combines 'floating' low profile keycaps with pleasant tactile switches, a volume dial and a wrist rest. These keyboards are normally available around the $70 mark, but today you can pick one up from Amazon in black for $48 - a good deal for a full-size mechanical keyboard from a major brand.