In stock on 10 August if you don’t mind to wait. Cheapest price from Australia local seller around $289
MSI MPG B550 Gaming Plus Gaming Motherboard (AMD AM4, DDR4, PCIe 4.0, SATA 6Gb/s, M.2, USB 3.2 Gen 2, HDMI/DP, ATX) https://www.amazon.com.au/dp/B089CRF5XV/ref=cm_sw_r_cp_api_i…
Says it is currently unavailable.