I haven't found anything cheaper than 10k for $60.
I would only buy them at the time I want to use them, which I've just done.
I would have paid the advance purchase rate, but in this case buying the points was still cheaper even considering the points that won't now be earned, and I get the (most likely unneeded) flexibility for "free".
I found a .056, .0575, and .05933. Nothing better than that.