first commit

Model/ConfigurableProduct/ResourceModel/Product/StockStatusBaseSelectProcessor.php

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+<?php
+namespace Nordcomputer\Showoutofstockprice\Model\ConfigurableProduct\ResourceModel\Product;
+
+use Magento\Framework\DB\Select;
+
+class StockStatusBaseSelectProcessor extends \Magento\ConfigurableProduct\Model\ResourceModel\Product\StockStatusBaseSelectProcessor
+{
+    public function process(Select $select)
+    {
+        return $select;
+    }
+}
+?>

Model/ResourceModel/Product/CompositeBaseSelectProcessor.php

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+<?php
+namespace Nordcomputer\Showoutofstockprice\Model\ResourceModel\Product;
+
+use Magento\CatalogInventory\Model\ResourceModel\Product\StockStatusBaseSelectProcessor;
+
+class CompositeBaseSelectProcessor extends \Magento\Catalog\Model\ResourceModel\Product\CompositeBaseSelectProcessor
+{
+    public function __construct(
+        array $baseSelectProcessors
+    ) {
+
+
+        // REMOVE THE STOCK STATUS PROCESSOR
+        //...................................
+        $finalProcessors = array();
+        foreach ($baseSelectProcessors as $baseSelectProcessor) {
+            if(!is_a($baseSelectProcessor, StockStatusBaseSelectProcessor::class)) {
+                $finalProcessors[] = $baseSelectProcessor;
+            }
+        }
+
+        parent::__construct($finalProcessors);
+    }
+
+}
+
+?>

Pricing/Render/FinalPriceBox.php

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+<?php
+namespace Nordcomputer\Showoutofstockprice\Pricing\Render;
+
+use Magento\Framework\Pricing\Render\PriceBox as BasePriceBox;
+
+class FinalPriceBox extends \Magento\ConfigurableProduct\Pricing\Render\FinalPriceBox
+{
+    protected function _toHtml()
+    {
+        $result = BasePriceBox::_toHtml();
+        //Renders MSRP in case it is enabled
+        if ($this->isMsrpPriceApplicable()) {
+            /** @var BasePriceBox $msrpBlock */
+            $msrpBlock = $this->rendererPool->createPriceRender(
+                MsrpPrice::PRICE_CODE,
+                $this->getSaleableItem(),
+                [
+                    'real_price_html' => $result,
+                    'zone' => $this->getZone(),
+                ]
+            );
+            $result = $msrpBlock->toHtml();
+        }
+
+        return $this->wrapResult($result);
+    }
+}

README.md

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+# nordcomputer-showoutofstockprice
+Show prices of out-of-stock products

composer.json

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+{
+    "name": "nordcomputer/showoutofstockprice",
+    "description": "Adds price to out-of-stock products",
+    "require": {
+        "php": "^7.1"
+    },
+    "type": "magento2-module",
+    "license": [
+        "OSL-3.0",
+        "AFL-3.0"
+    ],
+    "autoload": {
+        "files": [
+            "registration.php"
+        ],
+        "psr-4": {
+            "Nordcomputer\\Showoutofstockprice\\": ""
+        }
+    }
+}

etc/frontend/di.xml

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+<?xml version="1.0"?>
+<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">
+    <preference for="Magento\ConfigurableProduct\Pricing\Render\FinalPriceBox" type="Nordcomputer\Showoutofstockprice\Pricing\Render\FinalPriceBox" />
+    <type name="Magento\ConfigurableProduct\Model\ResourceModel\Product\LinkedProductSelectBuilder">
+    <arguments>
+        <argument name="baseSelectProcessor" xsi:type="object">Nordcomputer\Showoutofstockprice\Model\ConfigurableProduct\ResourceModel\Product\StockStatusBaseSelectProcessor</argument>
+    </arguments>
+    </type>
+</config>

etc/module.xml

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+<?xml version="1.0"?>
+<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Module/etc/module.xsd">
+    <module name="Nordcomputer_Showoutofstockprice" setup_version="0.0.1">
+    </module>
+</config>

registration.php

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+<?php
+\Magento\Framework\Component\ComponentRegistrar::register(
+	\Magento\Framework\Component\ComponentRegistrar::MODULE,
+	'Nordcomputer_Showoutofstockprice',
+	__DIR__
+);