This mod will let you 'save' 3 (or whatever #) pieces of inventory of each item. So if the true inventory is 50 pieces, the store will act like there is only 47. This will let you keep a stash around in case you need extras to replace customer's damaged or lost packages, or if your inventory is off by a few pieces.

For example, we have 83 Mintyboosts in stock:

But the cart displays only 80:

We'll be using the same file as the "Show IN STOCK over 100 quantity" mod above

Change the same settings as the "Show IN STOCK over 100 quantity" mod above

Files changed: /includes/functions/functions_lookups.php
/includes/functions/functions_general.php
/includes/modules/product_listing.php
/includes/modules/pages/product_info/main_template_vars.php

in /includes/functions/functions_lookups.php

find (line 172)

    return $stock_values->fields['products_quantity'];

and replace it with

    return $stock_values->fields['products_quantity'] - STOCK_OFFSET;

in /includes/functions/functions_general.php

find (line 130)

$button_check = $db->Execute("select product_is_call, products_quantity from " . TABLE_PRODUCTS . " where products_id = '" . (int)$product_id . "'");

and add a line below it so that it is looks like:

$button_check = $db->Execute("select product_is_call, products_quantity from " . TABLE_PRODUCTS . " where products_id = '" . (int)$product_id . "'");
$button_check->fields['products_quantity'] = zen_get_products_stock($product_id);

in /includes/modules/product_info.php

find (line 77)

  while (!$listing->EOF) {
    $rows++;

and replace with

  while (!$listing->EOF) {
    $rows++;
    $listing->fields['products_quantity'] = zen_get_products_stock($listing->fields['products_id']);

in /includes/modules/pages/product_info/main_template_vars.php

find (line 115)

$products_quantity = $product_info->fields['products_quantity'];

and replace it with

  // Stock Offset Mod
  $products_quantity = zen_get_products_stock($product_id);