Peacock's next growth bet isn't a blockbuster show or sports deal. NBCU's flagship streaming service is plotting to sell add-on subscriptions to other specialty streamers on its platform, four people familiar with the plans told Business Insider. Peacock has approached streamers about selling subscriptions to offer viewers content that complements its reality and sports-heavy line-up, these people said. Peacock expects to start with one streamer this year and is likely to limit the offering to