Just get a cheap Ryzen 3 2200G ($110-120 local set with vouchers/bank promos online, haggle for cheaper if you buy 2nd hand on carouhell) + ASRock A320M HDV R4.0 ($74 on lazada w/o any promos).
Reason I don't recommend Ryzen 3 3200G is because you'll need to update BIOS to support Ryzen 3000 series, too much hassle.
Recommended to get 2x4GB/2x8GB 3000mhz/3200mhz ddr4 ram. Average user don't need Samsung B-die, just get the cheapest rams you can find that fit these specs.
Sometimes you won't be able to run full ram OC speed when the ram is not on mobo ram QVL (eg. 3000mhz cl15 end up running at 2933mhz cl16), but it won't make a real difference so don't need to worry too much.
If you really want to squeeze your budget you can get 2x4gb 2666mhz cl15/16 rams for $69 online w/o any promos, cheaper if carouhell. You're not gaming so it's fine if you're not buying the optimal 3000mhz/3200mhz rams.
Just make sure it you buy your rams in pairs (eg. use 2x4gb instead of 1x8gb) because it'll improve the performance of your integrated graphics by a lot.
PC case: Any cheap $50+- case
PSU: Any 80+ PSU with 3-5 years local warranty $60+-
CPU: Ryzen 3 2200G $120+-
Mobo: ASRock A320M HDV R4.0 $74 lazada
RAM: 2x4GB 2666mhz $65+-
SSD: Any 240GB m.2 SATA ssd for $50+-
OS: Windows 10 OEM $10+-
Total: $429+-
Can be cheaper if you buy second hand parts or use vouchers/bank promos.
I built a set like this because it's so cheap (but with 2x4gb 3000mhz ram), even though it ended up collecting dust because never use I have no regrets
ASRock A300 Deskmini is really good, very small and compact but you have to pay more for it. Also can't get it locally have to buy from overseas.
If you buy this make sure you buy so-dimm ddr4 rams which is meant for laptops, don't buy the normal desktop rams as it wont work for this.