Without knowing more the cheapest is free (at the cost of some time). Find a static site generator + template + host on netlify/github pages (use their subdomain, or fork our a few dollars for your own).
Have a look at <a href="https://www.odoo.com/app/website" rel="nofollow">https://www.odoo.com/app/website</a> . If you just need a website, it's free. You can also add other paid apps afterwards.
Not sure if this fits the bill :<p>a) blot.im # I am a happy customer. Starts at 4$ per month.
b) <a href="https://mataroa.blog/" rel="nofollow">https://mataroa.blog/</a> # Not tried this. But looks promising.
There are many ways it can be free, but the free solutions require at least a basic level of tech knowledge to manage and deploy changes. Are you really looking solely at cost?