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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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The Oura Ring 4 is at its lowest ever price for Prime Day, with the steepest discounts on the most premium colors: the gold, rose gold, and the premium ceramic finishes. I expected some kind of discount because this is the first Prime since the Oura Ring 5 came out, but these prices are much lower than I would have thought—almost 50% off.

I wear an Oura ring myself, and have for almost five years now. (I've been a member so long I've been grandfathered into a lifetime subscription; everyone else needs to pay $5.99/month.) I've written about my thoughts on what the Oura ring is most useful for, and why I don't use it as a workout tracker. I've also got a review of the Oura Ring 4, which is this version that's on sale.

If you're wondering what you'd be missing by going for the 4 instead of the 5, it's not much: the 5 has a smaller profile, but the same functionality. There is one major advantage of the Oura Ring 4 over the 5 for some people, though. The newer 5 doesn't have as big a size range, so if your finger is small (size 4 or 5) or large (size 14 or 15) you may not be able to get a good fit in the newer model.

Oura Ring 4 deals

Oura prices its finishes differently, so the sale prices also depend on which color you're getting.

Oura Ring 4 - Black $226.00 at Amazon $349.00 Save $123.00 Get Deal Get Deal $226.00 at Amazon $349.00 Save $123.00

Oura Ring 4 - Silver $226.00 at Amazon $349.00 Save $123.00 Get Deal Get Deal $226.00 at Amazon $349.00 Save $123.00

Oura Ring 4 - Stealth $226.00 at Amazon $399.00 Save $173.00 Get Deal Get Deal $226.00 at Amazon $399.00 Save $173.00

Oura Ring 4 - Brushed Silver $226.00 at Amazon $399.00 Save $173.00 Get Deal Get Deal $226.00 at Amazon $399.00 Save $173.00

Oura Ring 4 - Gold $259.00 at Amazon $499.00 Save $240.00 Get Deal Get Deal $259.00 at Amazon $499.00 Save $240.00

Oura Ring 4 - Rose Gold $259.00 at Amazon $499.00 Save $240.00 Get Deal Get Deal $259.00 at Amazon $499.00 Save $240.00

Oura Ring 4 Ceramic - Cloud $259.00 at Amazon $499.00 Save $240.00 Get Deal Get Deal $259.00 at Amazon $499.00 Save $240.00

Oura Ring 4 - Ceramic- Tide $259.00 at Amazon $499.00 Save $240.00 Get Deal Get Deal $259.00 at Amazon $499.00 Save $240.00

Oura Ring 4 - Ceramic - Midnight $259.00 at Amazon $499.00 Save $240.00 Get Deal Get Deal $259.00 at Amazon $499.00 Save $240.00

Oura Ring 4 - Ceramic - Petal $259.00 at Amazon $499.00 Save $240.00 Get Deal Get Deal $259.00 at Amazon $499.00 Save $240.00

• Black and silver finishes are $226, normally $249.

• Matte black and brushed silver are $226, normally $399.

• Gold and rose gold are $259, normally $499. That's an incredibly good deal at 48% off.

• Ceramic finishes are $259, normally $499 (in white, navy, pastel green, or pink).

The ceramic finishes are going quickly. Most sizes still have the midnight (navy) available, and some have the white as well. The pastel green and pink are mostly sold out, unless you have a size 13, 14, or 15 finger—I still see a few in stock in those sizes.

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.