adding to list:
thermal CPU pad (it's way easier than using thermal compounds, and cools just as well as the best compounds out there) (you cannot get this at bestbuy)
https://www.newegg.com/Product/Product.aspx?Item=9SIA2W07HJ7887this is a list of all the items picked so far. not including the thermal pad. this is also not including a case. (this is with a single 2TB HDD)
https://pcpartpicker.com/list/Kbm9YTyou would have to talk with bestbuy online about price-matching. expect to pay $50-$100 more than this list, even with price-matching. (some of the items on this list are including rebates which won't count. they are close to prices i've seen on newegg though without rebates.)
you will need ~$70-$120 for a good case as well.
you also will need $10-$200 for windows 10. (you are reading those numbers correctly)
if you need an optic drive, that's cheap. or you can pull the cd/dvd drive out of your old pc. (they aren't much needed this day in age though. play old games on old machines)
if you need a wifi card, that will be extra as well. (the picked board only has wire connection)
after you confirm what you actually need for this, i may be able to upgrade parts. or i might have to down-grade.