build a website

Good afternoon, I have a website and I need someone to build in this site an online [login to view URL] shop. I choose the products and as i go adding them by their identifier (example: B013E5BI6M) they will be saved to a database of the page. I want to establish a way of appearing in first position on the page when the product price change in a desired quantity and always when the established range price is currently. I put an example to understand it better: the product that I mentioned above should appear on the page when it costs 16 € or less. If at any time the price changes and its 16 € or fewer, I show it in first position on the page, or from left to right (for example). A similar page would be [login to view URL] (though I want it much simpler, just checking the product in [login to view URL] and it meets my requirements. Each time a product gets cheaper, place it in first position in order of date, leaving the following in second place. About products: I will add them manually adding the product code (I mention the above example: B013E5BI6M) and added to a list of unlimited products I'll follow up on the web. The price update [login to view URL] should take it as soon as possible. If not in real time, with a delay of a few minutes. The idea is to make a single payment for this work, and establish an initial SEO for website, to position well in browsers. I think more SEO isn't needed because the objective of the website is to automate. I'm not interested in maintaining the page, I just want it built it and most important: the automation never fails. The link to the product must redirect to [login to view URL] with my referral ( to get comission, i work for them as affiliate).