FREE $100 GIFT CARD: Amazon is offering Prime members a bonus $100 gift card with the purchase of a Samsung Galaxy Watch Ultra.

Prime members on the hunt for a smartwatch upgrade can score an extra special offer right now at Amazon: As of April 21, the retailer is offering Prime members a bonus $100 Amazon gift card when they purchase the sleek Samsung Galaxy Watch Ultra for $649.99.

This deal applies to all available colors of the Samsung Galaxy Watch Ultra, so you can choose between titanium white, titanium blue, titanium gray, and titanium silver. Keep in mind this offer only lasts until April 26, so don't wait too long to jump on it.

The $100 Amazon gift card is an exciting extra, but the Samsung Galaxy Watch Ultra is a mighty fine upgrade on its own. This stacked timepiece boasts a very durable titanium design. It's "designed for rugged adventurers," according to our hands-on review — and offers plenty of features for those hoping to keep an eye on their health or fitness goals.

Some of these features include an activity tracker, heart rate monitor, sleep monitor, personalized running coach, dual-frequency GPS, Vascular Load monitoring, and an Energy Score, which takes into account your sleep, activity, and heart rate from the day before to see how ready you are for the day ahead.

If the Samsung Galaxy Watch Ultra sounds like the kind of smartwatch you've been hoping to buy, this is a great time to buy and score some bonus cash to spend.