NEW YORK (AP) — Amazon is beefing up Prime by letting customers of the $99-a-year loyalty service buy access to the premium TV channels Showtime and Starz.

Those channels will each cost an additional $9 a month. Amazon will handle billing for them and some other streaming services it's partnering with.

Amazon's move comes as TV lovers increasingly go online. It already has original series and mostly older seasons of traditional TV shows available free for Prime members. You can also buy current-season TV episodes.

Starz, whose shows include the historical romance "Outlander," is not available otherwise without a cable subscription in the U.S. Showtime, home to "Homeland" and "The Affair," is already available for Hulu subscribers for $9 a month and on its own for $11 a month.

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