It would take 4 licenses to cost the same as the unlimited license. So, if you are going to add a 4th camera or beyond, the unlimited license makes the most sense.
I have 8 cameras in my main group, a few more in my battery camera group, and even a few more that I use ad-hoc. So, an unlimited license can be quite a benefit once you get to 4 cameras.
What a deal- Depends what you have planned for the future. If you pay for four yearly subscriptions it cost you 22 U.S. cents a day. I started with 4 cameras and now I have 12 all on cam unlimited which cost me 27 U.S. cents a day total. If I add 87 more cameras it will still cost me 27 cents a day, total.
If I recall correctly, there are some grandfathered deals like old $15 annual for 1 license, $30 for 2 license, $35 for 3 license, and $50 for 4 license. However with the introduction of the new checkout system & backend changes to the website, I think those are no longer available.
Your recall is close. I had 4 individual yearly subscriptions on my first 4 cams and I believe the price was $14.95 per year for each cam. That was in 2020 and I don’t remember being able to purchase CP for 4 cams at one time, they were individual 4 purchases.