Question about selling FB stories/shoutouts

Hey everyone.. I've seen several posts about people buying stories and shoutouts on Instagram, but not so much in terms of Facebook. I own a few large Facebook pages (500K+/each) and was curious if there is as much demand for FB shoutouts/stories as there is for Instagram? Along with that, I was curious how people tend to go about pricing shoutouts.. I understand the size of your page, audience insights..etc play a role - but is there some solid ballpark figure per 1k or something to start at?

I plan to start reaching out to companies in my niche to see if there is interest in purchasing some status updates or stories, but would like to know how I should go about pricing. Also, if anyone else has done this before and owns a good template for sending to potential buyers that would be great. Even if it's targeted towards an Instagram page, it would give me something to go off of..

Thank in advance BHW!