I do that frequently, both buy and sell content. #seolife. The price depends on your niche, traffic and domain authority.

Twitter, VC.ru (Russian business site that focuses on tech), and a lot of Feedly, which makes it possible to stay within one app and read all I need to know, instead of browsing a ton of websites. I miss old school RSS readers, lol.
And of course my main project https://seobots.io gets a ton of daily visits from me 😅

Ahaha love SEO Bots which I already told u 😂