My first search for "Lopinavir cost" showed a $375 / 160 mL *cash* price (www.drugs.com Price Guide lopinavir/ritonavir).
My first search for "Ritonavir cost" showed a price of $95 / 30 tablets (www.drugs.com Price Guide ritonavir).
The first dosage I found -- naiive, as this is I presume for AIDS, so the dosage might be different for coronavirus -- would be 800 mg lopinavir/day and 200 mg ritonavir...
Sounds (handwaving) *rather* spendy, eh?