The 7RP discount codes may still work through the weekend. It will for a B30 which I probably will order. Just deciding on a color for my Black B30. I tried the Mai Tai insert & have issues with the sides bulging. Became nervous because I worried the sides may permanently stretch. I have 7RPs for my Kelly's with a perfect fit. For my other Hermès bags I've been using Mai Tai inserts. My thinking is though all my H bags are special, my B & Ks are extra special & deserve an extra special insert (even if the price stings a little!). These bags are expensive
I wish I had read your post before I purchased the Mai Tai insert for my bag. The MaiTai insert created permanent marks on my brand new Kelly 28. I waited for almost a year to get this color :’( I contacted MaiTai but they are not welling to resolve the problem. I can’t even get a refund for the ~$140 (+ shipping) purchase. According to MaiTai, “the insert’s material is so much lighter and softer than the bag's leather, and adapts to the bag's shape by crumbling/folding inwards” and they sent me the picture of the black insert. I took pictures of the pink insert I received which I can feel and see the hard corners from outside of my bag when filled with minimum amount of items.