Ryzen 5 5600G 6 Cores 12 Threads up to 4.4 GHz with Radeon (Vega, 7CU) Graphics Desktop Processor
$377.10 ($356.15 w/ eBayPlus)
Reasonable choice of processor for those who want entry level performing graphics to get by until discrete GPU price drops, especially when paired with the great value $71.10/67.15 motherboard MSI B450M Mortar MAX posted by doweyy. Reason of going with a B450 motherboard is because the Ryzen 5000 series APU only supports PCIe 3.0, so the PCIe 4.0 on B550 boards can't be utilised unless if you also upgrade the processor down the line. The PCIe 3.0 still has plenty bandwidth enough for GPUs including the likes of RTX3080 (see here for an investigative piece by Hardware Unboxed: https://www.techspot.com/review/2104-pcie4-vs-pcie3-gpu-perf...). The B450 board is also good for up to 12 cores Ryzen CPUs later down the track for those thinking about upgrade paths without overclocking or worrying about VRM temperatures.
In the case that you'd want to utilise PCIe 4.0 down the track, then probably to start with a CPU that supports it in the beginning - Ryzen 5 5600X for $368.10 ($347.65 for eBay Plus members). And if you've already got a discrete GPU hanging around that performs at levels similar or better than a GT1030, then the 5600G will likely not entice you for a standard mATX/ATX build.