While AMD was promising cheaper AM5 motherboards back in August last year, specifically talking about a starting price of $125, it took some time before we actually got them, as now, ASRock's B650M-HDV/M.2 microATX motherboard is listed at $124.99.
The motherboard in question is still not available and it has a launch price of $139.99, but has been discounted down to $124.99 on Newegg , which means it still fits the "starting from $125" announced by AMD during the launch of Ryzen 7000 series CPUs. Previously, the cheapest motherboard, based on the same B650 chipset, was listed at around $150.