Hi Thomas,
It sounds like what you want is an online store, also known as an ecommerce website. As you already know, there are so many options! Shopify is an ecommerce website building platform. Their specialty is ecommerce websites. Their $9 option, also known as Shopify Lite, is only for using their shopping cart and plugging it in somewhere else, such as another website. If you used Shopify, you would really need to pay the $29 to get the full website.
I haven't looked at Square stores, is that $12 option for an ecommerce website? If so, that would be a good deal. Square is a credit card payment processor (like Stripe is as well).
The difference between an ecommerce site and a regular site is whether or not people wanting to buy will be able to add something to their cart, then pay for it through a credit card processor. But for that you first have to have a cart on your site. You could do a simple website somewhere, Wix, Weebly, Bookmark, Jimdo, etc., then integrate a cart from somewhere else to the site, such as the ShopifyLite option. That
should cost you about $20-$25/month. Or you could just pay for the platform's ecommerce option, if they have one, and pay a bit extra for that. We finally opted for our store to be on the Wix platform. I like Wix because it gives complete
freedom as far as how to build the site as far as pictures placement, text placement, etc. whereas Weebly and Squarespace, and most others, give much limited options as far as where to place things like pictures, etc. They are much more restricted.
The real trick will be getting seen by potential customers. With the millions and millions of ecommerce stores out there, getting found is a bit tricky. But if you have niche-y type of items, that will certainly be helpful. It will also be helpful to get social media accounts going, such as
facebook and instagram and also post on them.
Good luck with it all!