How much do Youtubers like Meet Kevin (2MM sub) or Graham Stephan (4.7MM) charge per commercial?I have a product I am thinking of promoting with a Youtuber and am curious how much the big players charge.

Anyone venture a ball park figure or maybe your assumptions on how much they may charge per advertisement? Do Youtubers usually have a package or single ads?
https://www.reddit.com/r/smallbusiness/comments/1dem54q/how_much_do_youtubers_like_meet_kevin_2mm_sub_or/