Redirect mapped Domain To subfolder

OK, here is what I am trying to accomplish. I have multiple subfolders websites setup and I want to assign them domains using domain mapping. I also have woocommerce shopping carts setup on each of these as well. I currently have 1 SSL certificate installed on the server and main domain. If I map the domain to the different websites, it will make the SSL ineffective for the mapped domains. I would like a way that when people go to the checkout page, it would be a page on the subfolder domain https://yourdomain.com/subfolder/check-out instead of mappeddomain.com/check-out.

Is there a way to do this? I could have up to 150 sites on this one multisite installation running this way and I dont want to have to pay for that many domains to be on a multidomain ssl.