its in fact the best boycott. boycotts have nothing to do with personal sacrifice. rub it in their faces and force them to spend millions in DRM, or pay up.
i dunno about pricing in the us, but try get at least a BX50 tier motherboard. B450 works and might be cheaper, but make sure the bios is compatible with your chip.
i tend to highly favor taiwanese manufacturers like asus and msi. i don’t think anything else is worth spending your hard earned money on.