Costco Rogaine Alternative

For the last 6 months, I've been trying Costco's Minoxidil Foam to see if I could find any difference in performance between it and the Rogaine brand. From what I could determine, there wasn't any difference. They're both 5% Minoxidil foam. There is a good difference in price. A 4 month supply of Rogaine foam will cost you $49.99 at Costco. A SIX month supply of Costco's Kirkland brand Minoxidil foam will cost you $48.99. That means you get 2 months of Minoxidil foam for free if you buy Costco's product. To me, the better deal is the Costco product. If any readers I have out there disagree, let me hear from you and why you think Rogaine would be worth the extra cost.