Plus, there are quite a few folks who have scored in the Monday sales. I'm thinking they are pretty happy with the model, and it's far from a failure.
I think all of us who frequent here are going to have to get prepared for the highs and lows (thrill of victory, agony of defeat

) that the Monday sales bring.
As far as a 'Go' option, a quick post rotated each week between the social media Survive! uses - Bladeforums - Instagram - Facebook - etc. would work. Simply state in the newsletter that this week the 'Go' post for the Monday sale will be posted at 'X' time period on 'X' social media site. For example, "This week the Monday Sale will occur late afternoon PST. The Go/Heads up/Announcement will be posted on the Survive! subforum of Bladeforums

Then, immediately after listing the blades for sale on surviveknives.com, start a thread on the social media site that says, to the effect, Monday sale begins now!!!
That does a few things,
-builds demand for the newsletter that leads to educated customers
-builds following on the respective social media sites
-helps the customer narrow it down to one place to watch for the go
-gets everyone on the same page as to when is this happening/did this happen/did i miss it?