There is a jp one here, but it released in PAL and America through square enix
I've added the PAL version.
https://www.pricecharting.com/game/pal-playstation-4/oninaki
I don't see any record of an NTSC physical release though.
These games are on switch but need to come for ps4 too
Let us track Rom Hack games such as Dragonball Kart, or Pokemon Crystal: TwitchplaysPokemon Edition. There are all sorts of ROM hack games on eBay so they may be tricky to track, but I know that some collectors like to collect them. ROM Hacks are probably most common on Pokemon Games, such as Pokemon Ash Gray and Pokemon Uranium, and plenty of them have been released physically.
The prices set under it in the collections page do not seem to update when a new item is added.
For example:
If i have Super Mario Bros set at 5 dollars, then add Mario 2, Mario 1 will be set to 0, and Mario 2 will now be at 5.
Add "visual novel" to the genre picklist. It's very common to see VN titles on Vita and Switch mixed between "Action & Adventure," "Simulation," or even "Other" which makes tracking them down using the Genre filter a challenge.
Let us know what features you want on PriceCharting.