At $79, the add-on is even cheaper than it was before Amazon raised its price from $99 to $119 last year. Not that anyone needs a breakdown of Prime anymore, but in addition to free one- and two-day shipping, it includes access to Prime Video and Prime Music, among other perks. Prime Video, in particular, has become surprisingly good in the last year.
A couple of restrictions to note before jumping on the deal: you can’t take advantage of the discount if you’re already a Prime Student subscriber. Additionally, it’s not possible to use Amazon and partner rewards points to make the subscription even cheaper.