Do-It is about the best company around for getting stock items back on the shelves so hold tight. Shouldn't take long.
I have several, well ok, lots, of M-F colors and a whole pile of colors that I have no idea from where they came but my mainstay is the X2. I'm also a fanatic about saving those partial cups of cooked colors should I happen to run low on colorant. I don't run low very often. In fact I can't recall ever getting low. But those cooked plugs have come in darned handy from time to time so think about holding onto a few of those colors you may get low on.
In a pinch you can add a bit of raw plastic to your color bottle that's getting low, shake it up and just add a couple more drops to your recipe.