The Tech Report points out that Monoprice offers a mechanical keyboard that costs just $57.99!
The keyboard features Cherry MX Blue switches
but other than that its feature-set is limited to the bare basics, it doesn't even have media keys.
Uses Cherry MX Blue switches
Gold plated switch contacts
Switches rated for over 50 million keystrokes
2 mm keyswitch actuation distance, 4 mm full throw distance