Sabrefinalsale I believe. But the Sabre is sold out now, I couldn't add it to cart anymore a couple of days ago. Only after Bob update the website with more pictures of the Master and inply the real-time market things, that the glitch allowing Sabre to be added to your cart appears.
TL;DR: it's probably a glitch, you shouldn't try as your order will be canceled anyway, save you and Bob's time.
No worries, my goal was not to try anything fishy. But if there are some that are still up for grabs (Cancelled orders, carts expiring, denied cards and whatnot), I wanna have the chance of grabbing a pair.
If I can't, I still have the PM6 to fall back on.