This mod will make traders have a much more limited stock of items available for purchase. I use this for more hardcore economy runs.

{
"timeBetweenUpdates": 115, //How often to re-shuffle their inventory. Should be run more often than traders reset.
"tradersToLimit": //remove or add traders you want to have adjusted. Probably works for modded traders, but havent tried.
[
"5a7c2eca46aef81a7ca2145d", //Mechanic
"5ac3b934156ae10c4430e83c", //Ragman
"5c0647fdd443bc2504c2d371", //Jaeger
"54cb50c76803fa8b248b4571", //Prapor
"54cb57776803fa99248b456e", //Therapist
"5935c25fb3acc3127c3d8cd9", //Peacekeeper
"58330581ace78e27b8b10cee"//Skier
],
"categories": //Check Traders Currencies and Handbook IDs for category IDs or https://db.sp-tarkov.com/
{
"5485a8684bdc2da71d8b4567": //Ammo
{
"base": 150, //The base count of an item. In this case 300.
"random": 50//The variance of the base count. With this being 200, and Base being 300. The total spread is 100-500, or 300+/-200
},
"543be6564bdc2df4348b4568": //Throw weapon (Grenades)
{
"base": 7,
"random": 4
},
"543be5dd4bdc2deb348b4569": //Money
{
"base": 3000,
"random": 1500
},
"5447e0e74bdc2d3c308b4567": //Special items (markers, cameras, etc)
{
"base": 100,
"random": 0
},
"5448bc234bdc2d3c308b4569": //Magazines (for weapons)
{
"base": 4,
"random": 3
}
},

//If an item isnt under a specified category above. It will use the settings below.
"defaultBase": 5,
"defaultRandom": 2,

//Remove max buy count?`
"removeMaxBuyRestrictions": true,

"loyaltyMixup": false, //Alllow items to rarely drop down an item category.
"loyaltyMixupChance2": 0.03, //Roll 1 to drop down 1 category
"loyaltyMixupChance3": 0.03, //Roll 2 to drop down 1 category
"loyaltyMixupChance4": 0.03//Roll 3 to drop down 1 category.
//each roll is made individually and compound.
//This means the odds of dropping down tiers are: (if the math is wrong, sue me. IDGAF)
//1 tier: 8.7%
//2 tiers: 0.27%
//3 tiers: 0.0027%
}

This mod was inspired by some of the options of realism mod, but no code have been copied. (or even looked at)