Also available @ https://www.nexusmods.com/monsterhunterworld/mods/2058 but this repo will be the best spot to get the most recent updates.
Now Requires Stracker's Loader
https://www.nexusmods.com/monsterhunterworld/mods/1982
A default "shopList.slt" file has been included so you don't have to extract it manually.
In order to use created shop list files, place the "shopList.slt" file in "steamapps\common\Monster Hunter World\nativePC\common\facility"
If the nativePC folder or any necessary subfolders don't exist, create them.
Only the file named shopList.slt will be read by the game, so you can leave the application in "nativePC\common\facility" and create and name multiple files for your own presets, switching them as desired.
Usage
Open the included shopList.slt file, make your changes, then save the file into "steamapps\common\Monster Hunter World\nativePC\common\facility".
A default "itemData.itm" file has been included so you don't have to extract it manually.
In order to use item price files, place the modified "itemData.itm" file in the "steamapps\common\Monster Hunter World\nativePC\common\item" directory.
If the nativePC folder or any necessary subfolders don't exist, create them.
Usage
Open the included itemData.itm file, make your changes, save the file and copy it into "steamapps\common\Monster Hunter World\nativePC\common\item".