I am in the same boat you are...
I slashed the sidewall of mine, so my options are buy 4 new tires and keep one of my old ones for a spare and sell the other 3 as spares, or buy 5 new tires and sell 4 as a set...
If I decide to just buy 4 new tires, I'll let you know but discount said they would give me a credit for 70$ each tire for the set of 4. I don't think they will give me a credit for just buying 3 of them because they can't sell them as a set.
Basically, I may have one for you at the end of April when the km2's are available.