(Image credit: Tom's Guide/Gemini) I've been an Amazon Prime member for over a decade. Throughout the years, I've seen membership fees balloon from $79/year to $139/year. That's a lot of money to pay for "free shipping," especially when I factor in other monthly expenses like my cell phone, internet, and Netflix bills. However, expedited shipping is just one of the many reasons I'm still a Prime member. There are plenty of Amazon Prime perks these days and I'm here to help you uncover the best hidden Amazon Prime perks beyond Prime Video . From exclusive Subscribe & Save discounts to free Grubhub+ membership, these are the perks that keep me from cancelling my Prime membership. So whether you're a current Prime member navigating through the endless number of perks or someone who's on the fence about joining, I'm listing the best Prime member benefits that can justify that $139/year price tag. I'm also curious to know what your favorite perks are.…