The marketing budget for a presale or ICO can range from $50K to $500K+
depending on the project's scale and goals of course.

Best websites for promoting a crypto project include:

CoinMarketCap and CoinGecko for listings
Cointelegraph and Bitcoinist for press releases
Google Ads (though restrictions exist) and Crypto ad networks like Coinzilla
Influencer marketing on YouTube and Twitter (X)
Bitcointalk forum for community engagement.

Good luck with your research!