Yeah, I avoid ordering from Mcmaster at all costs now.
Other companies can figure out how to charge a flat rate, or a reasonable rate. Mcmaster you add a $1 delrin rod to your order, now you've rolled the dice on paying an extra $20 shipping charge because they can't consolidate warehouses.
I have been buying from McMaster since the early 70's. Originally you needed a business to get a catalog, so I lived with second hand catalogs from my employer. In the early 80's, I got a legitimate business and my own catalogs.

It's the only company I have known whose catalogs were considered such treasure. I still have its last paper version.
That adverse change in shipping seems recent. In the example I mentioned, they were not unusual products. I suspect it is more than just incomplete warehouse inventories. Maybe it is some plan to level product aging or overstocking in its warehouses. In any event, you cannot really tell which warehouse(s) will be shipping without a phone call. That seems counterproductive. However, if you live near one of its warehouses and can do "will call" pick-up, it is really hard to beat for service.