Option to purchase more folders at a one-time price rather than a monthly subscription

Just wanted to say that I would really like the option of purchasing more collection folders for a one-time fee. I understand the benefits of a monthly subscription, but that is why I ended up finding this site because it offers free use up to 3 folders. I’m just a collector and want to have a place where I can easily access my cards without a monthly/yearly fee. I’d gladly pay once for each extra folder though.