The costs always vary, but I made a list that will help you to understand the ICO PR costs:
Articles on popular crypto websites - 2,000$–12,000$ Per Article. On Cointelegraph, for example, the price is 1–2 BTC to submit your PR article.
*Here is a full list of ICO rating sites of 2018 where you can publish your material
Youtube Influencers - $5K - $40K per video.
ICO Community Management - The price can go from 7,000$-20,000$.
Content Writers - In case you don’t have a content writer on your team You will probably need to hire a freelancer. Price per article can go from 50$-500$ for a high-quality article