I've signed up for free blades before from Lennox and received them.

Click the link, then click 'Get a Free Blade'. A new window will show up and a flash program will begin. Go to the 'Test Lab', then 'Warehouse', then sign-up at the 'Loading Dock' by clicking the Box. (You are required to go to Test Lab and Warehouse before signing up)

The Flash program did go significantly slow, but I'm presuming it was a large influx from many users at once signing up after email offer, like me.