Interestingly, in the Apple App Store, there is no option to filter by "paid". Only free. I want an option to filter by "paid, no IAP". Actually, I don't mind IAp for things like new levels and such. It's just so badly abused by mobile games.
At one point in-app purchases were listed clearly and prominently so they were easy to inspect (and hopefully embarrassing for nonsense like $99 wheelbarrows of smurfberries[1].) Now it seems like IAP rates are hidden below the fold, unfortunately.
[1] https://www.pipelinecomics.com/smurfberries-apple-app-store-...
So now there's an alternative way to pay. Let's be happy about that.
... actually, I just checked, and if you scroll down enough in the Games tab on your iPhone's App Store app, they seem to be running it now under "Pay Once & Play". Might be worth a look.