Prime Day is June 23 to 26, and Lifehacker is sharing the best sales based on product reviews, comparisons, and price-tracking tools before it's over. 

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• New to Prime Day? We have a primer on everything you need to know. Sales are accurate at the time of publication, but prices and inventory are always subject to change.

As someone who has trained for seven marathons in the past seven years, I can tell you that the right running watch is a powerful tool. I’ve come a long way on this front, considering I ran my first few marathons with no watch at all. Now I keep my Garmin Forerunner 970 on my wrist at all times. 

Garmin recently released the Forerunner 70 and 170, meaning its older models—which are still excellent—are perfectly primed for Prime Day discounts. Garmin watches have a stellar reputation in the endurance sports world for good reason: they deliver detailed metrics and reliable GPS tracking, usually with a multi-week battery life. Here are the best Garmin deals that have stood out to me so far during this year's Prime Day sale.

The second-generation Garmin Epix Pro is half off

The Garmin Epix Pro (Gen 2) Sapphire Edition is a whole 50% off, bringing its usual $999.99 price down to $499.99. The reason for such a major discount is because Garmin has since merged the Epix and Fenix product lines, and this model has been replaced with the Fenix 8 series. Still, this watch holds up. It's got you covered for tracking your sleep and blood oxygen levels, measuring your VO2 Max, tracking 30 activities, offering a multisport mode, plus extras that most running-specific watches don't have, like golfing features, tides, and fish forecasts.

The Garmin Forerunner line is a great deal right now

If the Epix Pro feels like overkill, the Forerunner series is where you want to focus your attention.

• The Garmin Forerunner 55 is $149.95, down from $199.99: This is the most basic of the Garmin running watches you can buy new. Don't be deterred by the word "basic." As my colleague Beth Skwarecki reports, it was good enough for Sabastian Sawe to wear to break the sub-2-hour marathon barrier earlier this year.

• The Garmin Forerunner 165 is $199.99, down from $249.99. This is my favorite entry-level running watch. The music version is also on sale; as always, it runs $50 more than the standard.

• The Garmin Forerunner 265 is $349.99, down from $449.99: Although it isn't the latest and greatest anymore, this is still a fan favorite amongst Garmin users. It's a step above entry-level options, with dual-band GPS, power meter compatibility, and advanced analytics (like training status).

The Garmin Vivoactive 5, a Lifehacker favorite, is $40 off

Stepping back outside the Forerunner lineup, the Garmin Vivoactive 5 is on sale for $189.99 (normally $229.99). This is another Lifehacker favorite, and it's a solid choice for most casual athletes. It's since been replaced by the Vivoactive 6 ($299.99), but the 5 is still a great watch.

Looking for something else? Retailers like Walmart and Best Buy run Prime Day-style sales that are especially useful if you don’t have Amazon Prime.

• Walmart’s Prime Day competition sale runs from June 22-28 and includes deals up to 50% off. It’s an especially good option if you have Walmart+. 

• Best Buy’s Prime Day competition sale runs from June 22-28, and has some of the best tech sales online. It’s an especially good option if you’re a My Best Buy “Plus” or “Total” member.

• Target’s Prime Day competition sale runs from June 23-26, with deals up to 50% off. You can become a Circle member for free.