Thanks, OP. The cookie edit worked! However, note that you should make the edit just before checking out, otherwise, the site seems to override it somehow. This happened to me twice, voiding the BRTAX40 code, but overwriting the cookie again fixed it.
It looks like they just caught on to the sale items working with the 40% off. I had one sale item in my cart, had the code work, then went back to look at a couple more things and when I came back to my cart it said that the items weren't valid for that discount.
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