Mechanical keyboards are growing in popularity these days, but typical prices of $80 and up can still be prohibitive for first time buyers. For the price sensitive, Amazon.ca has a popular mechanical keyboard on sale right now -- the Razer BlackWidow Mechanical Gaming Keyboard is $59.99 with free shipping. That's about as low a price for a mechanical keyboard as you're going to get.
The Razer BlackWidow Mechanical keyboard uses Cherry MX Blue switches which provide a lot of tactile feedback and an audible click when pressed. As this is keyboard designed for gamers, it has 5 programmable macro keys on the left. The keyboard has a rating of 4.5/5 stars with 6 reviews on Amazon.ca, and a rating of 4/5 stars with 290 reviews on Amazon.com.
Amazon's prices can jump around without notice, so don't sit on the sidelines for too long if you're looking for low cost mechanical keyboard.