Sellout.Woot has the Vi Sense Heart-Rate Headphones for $40, This also includes 1-year of the Vi Personal Training App (usually $10/mo or $100/year).
The Vi App essentially sets you up with a workout plan (i.e. I want to run a half-marathon in 3 months from now) and will also offer coaching and pacing tips during your workouts (i.e. "Speed up, you're going to slow"). It also has little speedplay games like "In 30 seconds, start a sprint")
Bad news for Android users - it seems that they've killed off support for Android
Good news for iOS - the app is still available in the Apple store, and they have their new app Torch running, which essentially pairs you up with another random to compete in running challenges with.
The headphones are decent, stay in your ear well while running, and have good quality sound, but you can probably find better buds for slightly less money on amazon. Still, if you want to give the app a shot and you're on Apple, might be worth it.
Vi App-
https://apps.apple.com/us/app/vi-trainer/id1110279482Torch App-
https://apps.apple.com/us/app/torch-interval-run-tracker/id1475087814Headphone Link -
https://sellout.woot.com/offers/lifebeam-vi-sense-wireless-headphonesVi Website:
https://vitrainer.com/Torch Website:
https://torchrunning.com/