>>9271819a near impossibility at this point, they're too old to get a real hand on and at that in prime condition(either fresh out of the box or not agreed and damaged), the last time I saw of years ago was on eBay. I've never even seen em pop up on Amazon.
https://order.mandarake.co.jp/order/detailPage/item?itemCode=1047360066&lang=en one of the few places that keeps it listed up but it's sold out.
Also, the kits contained an alt pallet for X and Zero, just a color swap option but still there. Kits like this one aren't even made anymore by my guess