Have you ever considered LCSC?
It's more expensive than Ebay / Ali / China_ripoff_store, but often about half the price compared to Mouser / Digikey / Farnell / Westen_Extortionists, while quality is comparable, and they also sell lots of products that are not available from those Werstern Extortionists.
Do you see 5ct Padauk Microcontrollers on those shelves?
I'm guessing that the Microchips, MSP's and other uCls cost about as much to manufacture nowaday's as the Padauk's, but why would they sell them cheaper as long as they have enough customers willing tho pay their prices?
In this capitalist werstern world there is *** NO CORRELATION *** between the price to manufacture something and the price you have to pay to buy it. There is only one single exception. If customers are not willing to pay more for a product than it costs to manufacture, the produt ceases to exist.