Thank! But to be honest, I'm a little disappointed.
At first, I was delighted to see the Mobile IronSource Collection. But then I discovered that it is part of the Construct Master Collection (which includes the Mobile Master Collection, which I recently bought). That is, now, to get the plugin that I need, I must purchase a collection that already contains half of the plugins that I bought recently (i.e. pay twice).
It is unfortunate that there is no way to buy some plugins separately, or to get a discount on the entire collection if you already have a part of it.