When I first reviewed the Garmin Forerunner 255, I said it was a steal for runners who wanted dual-frequency GPS at a more palatable price. Well, thanks to Prime Day discounts, it’s even more palatable at $219.99 — a whopping 45 percent off list price.
Dual-frequency GPS makes a big difference for accuracy, but most other watches with it still cost a pretty penny. Garmin’s Epix watch is als...