Rogaine is the brand name for Minoxidil, one of only two approved products to treat hair loss as of 2014 (the other being Finasteride). Initially, Rogaine was only approved in a 2% topical version that was later expanded to a 5% topical version.
However, in more recent years, Rogaine has been made available in a foam version that is far easier to apply than the topical solution (which often rolls onto the face after application). Initially, only men were approved for the 5% foam version, while women were limited to the 2% version. However, now even females can get the 5% foam aerosol can.
Typically, one can of Rogaine foam lasts for a month (assuming twice a day application) and the retail price of each can is around $20-$30. A pack of 3 cans is often sold for around $50. However, both the one can and three can supplies are often available at significantly discounted prices.
Although it won’t grow new hair on a totally bald scalp, Rogaine foam 5% (Minoxidil) is a very good product for maintaining hair. I use it at least three or four times a week. For best results, you are supposed to use it twice per day, but I never use it more than once a day.
Unlike the old liquid version, the foam does not cause a mess or trickle down your face or back of neck, dries rapidly, and actually holds your hair like a weak gel.
Amazon currently has an incredible sale of one can for sale at only $10 (usual price = $30). Note that there are only limited quantities available:
Edit: Seems like the product is sold out at that price. Some decent discounts still available for 3-month supplies shown in the photo above.
Rogaine Foam in Canada
Note that sometimes, you can find Rogaine foam for sale in Canada. At the moment, 1 US dollar = 1.32 Canadian dollars. The three can product is more likely to be on sale than the one aerosol can version.