first upload all files

Modules/Product/Http/Controllers/ProductPriceController.php

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+<?php
+
+namespace Modules\Product\Http\Controllers;
+
+use Modules\Cart\CartItem;
+use Darryldecode\Cart\ItemCollection;
+use Modules\Product\Entities\Product;
+use Modules\Product\Services\ChosenProductOptions;
+
+class ProductPriceController
+{
+    /**
+     * Show the specified resource.
+     *
+     * @param int $id
+     * @return \Illuminate\Http\Response
+     */
+    public function show($id)
+    {
+        $product = Product::queryWithoutEagerRelations()
+            ->select('id')
+            ->withPrice()
+            ->findOrFail($id);
+
+        $variantPrice = $this->cartItem($product, request('options', []))
+            ->total()
+            ->convertToCurrentCurrency()
+            ->format();
+
+        return product_price_formatted($product, function ($price) use ($product, $variantPrice) {
+            if (! $product->hasSpecialPrice()) {
+                return $variantPrice;
+            }
+
+            return "{$variantPrice} <span class='previous-price'>{$price}</span>";
+        });
+    }
+
+    private function cartItem(Product $product, array $options)
+    {
+        $chosenOptions = new ChosenProductOptions($product, $options);
+
+        return new CartItem(new ItemCollection([
+            'id' => $product->id,
+            'quantity' => 1,
+            'attributes' => [
+                'product' => $product,
+                'options' => $chosenOptions->getEntities(),
+            ],
+        ]));
+    }
+}