Tipster @chi11edog released what appears to be a leaked price list for an entire lineup of MSI B660 DDR5 motherboards, starting at US$119. With extant Z690 boards starting at US$220, this could give budget builders a path forward to Alder Lake.
https://www.notebookcheck.net/MSI-B660-DDR5-boards-leak-with-prices-starting-at-US-119-could-help-bring-Alder-Lake-and-DDR5-to-the-mainstream.583001.0.html