Inexpensive Rogaine Foam

[montreal6130]

Hi,

I've been using Rogaine foam but noticing that one bottle lasts less than a month (more like 3 weeks). I live in Canada and right now I've been paying ~$18/bottle (off eBay including shipping costs).

Does anyone has any recommendations for getting the product online at an even better price? And is there any difference with the Kirkland brand name version?

Thanks.