Digital marketing companies makes SEO packages keeping in mind many factors which we will discuss:
1.The SEO packages are made different for national clients and international clients, services in the package may vary a little.
2. SEO packages for E commerce companies are totally different then normal SEO packages as generally the number of commodities are more than normal companies. and also there are many things to be optimized in the case of E commerce website.

This was a small summary on SEO packages offered by Digital Marketing Companies, to get into detail on this topic you can go through the link mentioned below. https://www.algosaga.com/packages/seo.html