There are several low-cost eCommerce website platforms available that can help you set up an online store without breaking the bank. Here are some of the best options:

1. Shopify: Shopify is one of the most popular eCommerce platforms, offering a range of pricing plans including a low-cost option called "Shopify Lite" starting at $9 per month. It allows you to sell products on an existing website or social media channels without a standalone online store. Shopify also provides various templates, payment gateways, and integrations to enhance your store's functionality.

2. WooCommerce: WooCommerce is a plugin for WordPress, making it an excellent choice if you already have a WordPress website. It offers a free base plugin with additional paid extensions available for enhanced features. WooCommerce is flexible, customizable, and provides a wide range of themes and plugins to create a professional online store.

3. BigCommerce: BigCommerce is another popular eCommerce platform known for its user-friendly interface and robust features. While it may not be the cheapest option, it offers a competitive pricing structure starting at $29.95 per month. BigCommerce provides a range of built-in features, including responsive themes, secure hosting, and multiple payment gateways.

4. Wix: Wix is a website builder that also offers eCommerce functionality. It provides an intuitive drag-and-drop interface, making it easy to build an online store. Wix offers various eCommerce plans starting from $23 per month, which includes features like unlimited bandwidth, secure hosting, and customizable templates.

5. Squarespace: Squarespace is another website builder that offers eCommerce capabilities. It provides visually appealing templates and a user-friendly interface. Squarespace offers eCommerce plans starting at $18 per month, including features like mobile optimization, inventory management, and secure checkout.

When choosing the best low-cost eCommerce website platform, consider your specific needs, such as the number of products you plan to sell, payment options, customization requirements, and scalability. Additionally, check for any transaction fees, add-on costs, or limitations that may affect your overall budget.

It's always recommended to visit the official websites of these platforms to explore their pricing structures, features, and customer reviews to make an informed decision based on your specific requirements.