Xfinity nesn increase

Hi all. I’ll admit I’m not tech savvy. We just got a letter saying our Xfinity will no longer be offering nesn and nbc sports Boston unless we pay a premium. How do you go about getting nesn. Wife mentioned Roku and coworkers mentioned other platforms but I’m not sure what they are. Is there a way to stream maybe elsewhere i guess is what I’m asking or do you need to upgrade with Xfinity. Really keeping it for the bruins Thank you.