CowBoom cuts 20% to 65% off a selection of new and used smartwatches and fitness trackers during its Wearable Tech Sale, with prices starting from $19.99. Even better, take an extra $10 off orders of $100 or more via coupon code LEARN10. Plus, most items receive free shipping. Coupon expires July 30.

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Note: No warranty information is provided for used items.