The author linked the parts. The link to the Longi LR4-60HPH-360M panels shows a $200 price (x 21). I had to google for the inverter, a Solar Edge SE6000H-USS3, to find a price ($2000 x 1).
> I ended up getting a 7.56 kW solar panel system consisting of 21 LONGi panels[1] and 1 Solar Edge inverter[2].