Cheapest blade I've seen come out of the Yard (with a handle & in the last 2 years) was the Wiener Dog. It was 154CM, and released at $59 via Ganzaa. Using the 511 at $89 as context, I'd wager the following:

311 - $69
411 - $79
511 - $89 (good guess?)
611 - $99
711 - $119
911 - $139

After looking at original pricing for some of the past releases...it's hard to conceive that the 511 is being released at such a FANTASTIC price!!

JYD #121
The chief cause of unhappiness and failure is trading what you want most in life for what you want at the moment.