Which rails ready-made solution for a small simple online shop?

I’m looking for a ready-made solution for a small simple online shop.
The requirements are the following:

  • It works out of the box
  • User-friendly UI: business owner can add, edit, delete products for
    sale, their prices, their pictures and their descriptions
  • Product categories
  • Filtering by category, product name and etc
  • Pre-built themes/templates (I’m not good at web design)
  • No billing support is required
  • SEO-friendly
  • Extensibility (addons/plugins)

Any suggestions?

If you’re looking for something completely turn-key, check out Shopify.
Yes, it costs money, but it handles a lot of this stuff for you.

Yes, Shopify. Or GitHub - spree/spree: Open Source multi-language/multi-currency/multi-store eCommerce platform