duh...use blue sensor mirrors
OP, many brands did a more limited production run, reduced material availability and shipping issues have coincided to have very limited availablity at this time in the season. This year, the smart person would have placed an order or bought in Aug/Sept. My main shop said they were only able to get their pre order inventory, doubt they could get more and some item were just sold out at the distributor level. My daughter is still waiting for some stuff she ordered in Aug/Sept and they noted that they are not shipping til mid dec. Her smith proform even took awhile to arrive.
Yeah, this time of year is tough for hot items like the I/O or IO/X. Happened to me last year. I was dead set on a pair of I/Os but everyone and their mother seemed to want a pair.