I´m a german Youtuber who creates high quality Gaming Videos such as Commentaries, Guides and Reviews and have 25k Subs. (https://www.youtube.com/halbwurm)
I would fade in a dedicated Intro about your product at the start for approx. 5 seconds and a longer outro with detailed information at the end for 20-30 seconds, and that this video is sponsored by you.
We could do this for the next 5 videos of mine for example, so that you get a lot of different views over a longer period of time. I can tell you that those videos would get much more views than a specific review video on my channel. This would be 150$.
To give you a better idea, here is the link to one of my videos with a similar promotion: https://www.youtube.com/watch?v=glsYzQsvJQI
Please let me know what you think of this idea, I am also open for suggestions!
1 Sponsor text and link in video description
1 Coverage of sponsor or product in Youtube video
1 Pre-roll inclusion of sponsor-provided content in Youtube video
1 Post-roll inclusion of sponsor-provided content in Youtube video