I think people should stop saying “availability is drying up” unless they are going to the ends of the earth to demonstrate that. It’s really not, i can find X bucket space on pretty much any day of the week. If you are using a point and click OTA then you just aren’t using a powerful enough tool to find inventory. Even ITA doesnt do a good job of finding all options unless you spoon feed it specific flights. If you really want to see thr full scope of availability, use a real live TA.