How do you find those, though? There are no filters. Only way I can do it is to tap through each search result, scroll down to “In-App Purchases: Yes”, tap it

How do you find those, though? There are no filters. Only way I can do it is to tap through each search result, scroll down to “In-App Purchases: Yes”, tap it, and (99% of the time) see something like “Bucket of Gems: $99.99”) and “nope” back out.