A shop MVP is the smallest setup that lets you sell online properly: terms, returns policy, company details, a handful of products, cart, payment and shipping.
WooCommerce on WordPress is often cheaper to launch with a small catalogue; PrestaShop fits if you already expect fast growth in products and rules. Be careful with high monthly SaaS fees if low fixed cost matters — unless you deliberately want hands-off hosting.
Save on: simple, clear theme instead of custom design, phone photos with good light at first, short descriptions instead of long copy. You can add integrations and marketing later.
Remember post-launch costs: hosting, domain, payment gateway fees, maybe accounting. Cheap doesn’t mean low quality — it means a clear scope and a growth plan. We can suggest a sensible path for your budget.