HBO

Amazon Prime members can now stream all the "Westworld," "Game of Thrones" and "Last Week Tonight" they want -- for an extra $15 a month.

HBO and Cinemax are the latest premium channels available to Prime subscribers via Amazon Channels, the e-commerce giant said Thursday. Last year, Amazon began letting Prime customers add cable channels like Showtime and Starz to their existing membership for an extra monthly fee.

A monthly subscription for HBO on Amazon Channels is $14.99, similar to the HBO Now streaming option. Cinemax costs $9.99 a month.

"For years now, Amazon has demonstrated an incomparable capability for bringing customers exactly what they want, in all the ways they want it," said Sofia Chang, HBO's vice president and general manager of worldwide digital distribution and home entertainment. "We share the goal of providing Amazon customers more ways to access all of the high-quality HBO and Cinemax programming they've been asking for."

Older HBO programming is still available on Amazon Prime Video through a separate deal two years ago. That covers series, like "Boardwalk Empire" and "True Blood," movies and specials airing at least three years earlier on the network.