Increasing Price For Spawner Shop

Plugin category: Not Sure

Minecraft version: Paper 1.12.2

Suggested name: SpawnerShop

What I want: I really need a plugin that can increase the price of spawners, per how many they have bought. For example, if a player has bought 10 villager spawners, I then want the price to increase, then after another 15, increase again and so on, (all prices customizable in config). Needs to be a GUI!

The increase of price should be off how many they have bought previously IN THE SHOP, rather than how many have been placed on their island

I use SilkSpawners for my spawners plugin and WildStacker for the stacking plugin.

Ideas for commands: /spawnershop
Also needs a command like (for example) /spawnershop set {player} {spawner} {amount} so that if a player already has 1000 villager spawners now, I can set their /spawnershop to the correct pricing.

Ideas for permissions: spawnershop.open

When I'd like it by: As soon as possible - hopefully by Sunday or earlier