$85 AMD Ryzen 3 2200G
$77 Gigabyte B450M DS3H rev 1.0
For $8 less, the $69
Gigabyte B450 Aorus M looks like a better choice. It has a better arrangement of the PCIe slots, if nothing else.
$43 2x4 GiB PC4-19200 Corsair Vengeance LPX CMK8GX4M2A2400C16R (DDR4-2400, 16-16-16-39)
For the RAM I'd prefer to get G.Skill due to local availability and past good experience but their RAM configurator for this board only lists 16GB+ Why would that be?
It's probably because they have assumed that almost no-one would build a new system and not get at least 16 GiB.
APUs using integrated graphics really like memory bandwidth (up to DDR4-3200 = PC4-25600). DDR4-3000 is nearly as cheap as DDR4-2400. There is only $5 difference for a 16 GiB kit at DDR4-3000 vs. DDR4-2400. Here is where we should take your $8 saved on the motherboard and combine it with another $9 to $20 out of your pocket to get bigger and faster DIMMs.$60
2x8 GiB PC4-24000 G.Skill Aegis F4-3000C16D-16GISB (DDR4-3000, 16-18-18-38) <== My #2 choice
because it's the cheapest in this group.$63
2x8 GiB PC4-24000 G.Skill Ripjaws V F4-3000C16D-16GVRB (DDR4-3000, 16-18-18-38)$65
2x8 GiB PC4-24000 Corsair Vengeance LPXCMK16GX4M2B3000C15 (DDR4-3000, 15-17-17-35)$69
2x8 GiB PC4-24000 Crucial Ballistix Sport LT BLS2K8G4D30AESCK (DDR4-3000, 15-16-16-) <== My #1 choice
because of the tight timings and excellent RAM quality.$70
2x8 GiB PC4-24000 G.Skill Ripjaws V F4-3000C15D-16GVR (DDR4-3000, 15-15-15-35)$70
2x8 GiB PC4-25600 Corsair Vengeance LPX CMK16GX4M2B3200C16 (DDR4-3200, 16-18-18-38)$71
2x8 GiB PC4-25600 G.Skill Ripljaws V F4-3200C16D-16GVKB (DDR4-3200, 16-18-18-38)
I don't recommend skimping to get just 8 GiB or memory slower than DDR4-3000, but there are choices that are better than spending $43 on 8 GiB of DDR4-2400 with loose timings.$32
2x4 GiB PC4-19200 G.Skill Aegis F4-2400C15D-8GIS (DDR4-2400, 15-15-15-35)$38
2x4 GiB PC4-22400 G.Skill Ripjaws V F4-2800C15D-8GVR (DDR4-2800, 15-15-15-35)$43
2x4 GiB PC4-25600 G.Skill Ripjaws V F4-3200C16D-8GVKB (DDR4-3200, 16-18-18-35)