Ask HN: To Bring your project in front of 4000 people, how much should I charge?

I posted this 2 months ago and forget to follow up in comments.

Hi guys, I have a newsletter with 8k members and im looking if anyone would be willing to sponsor my newsletter. I have never had a sponsor before, but I would be happy to my first go here on HackerNews, and happy to learn about this way of monetization and publicly discussing too.

Niche - TV ShowBiz News - Weekly Mails. Members - ~8.5k

Open rate 30-35%. Demographics: USA & Canada majorly.

Lmk what you guys think!