SF_10.1, SF_10.2, SF_11.0, SF_11.1, SF_11.2, SF_12.0, SF_12.1, SF_12.2, SF_13.0, SF_13.1, SF_13.2, SF_13.3, SF_14.0, SF_14.1, SF_14.2, SF_14.3 - https://docs.sitefinity.com/for-developers-query-a-single-product

GetProductBySku.cs

using Telerik.Sitefinity.Ecommerce.Catalog.Model;
using Telerik.Sitefinity.GenericContent.Model;
using Telerik.Sitefinity.Modules.Ecommerce.Catalog;

namespace Telerik.Sitefinity.Documentation.CodeSnippets.SitefinityEssentials.Modules.Ecommerce.Products
{
    public partial class ProductsCodeSnippets
    {
        public static Product GetProductBySku(string sku)
        {
            CatalogManager catalogManager = CatalogManager.GetManager();

            Product product = catalogManager.GetProduct(sku, ContentLifecycleStatus.Master);

            return product;
        }
    }
}