The stock level is actually online, but I sometime "understate" the on hands value to compensate for email and off site sales. The idler inventory is actually accurate(I have one emaxx idler at the moment), but I should have another hundred or so by tomorrow or Saturday fresh from heat treat. :)
Not as long as you may think. These are a top seller - probably 1-1 1/2 months and they will be gone(but hopefully the next batch will be ready before they run out). I make the idlers every month or so in this quantity. :)