If your fitness resolutions are still going strong, consider investing in an affordable tracker to watch your progress. Check out our roundup of the week's best fitness deals for three options under $80. Copper Fit Unisex Step Fx Activity Tracker Store: Walmart Price: $9 EXPIRED Shipping: In-store pickup, or $5.99 s&h Lowest By: $4 Expiration: January 29 Most major retailers charge around $20 for this fitness tracker, but you can snag it for just $9! The LED display is easy to read and operate. It has a three-action motion sensor and a removable module. It tracks distance, steps, calories burned, and your weekly average. With orders of $25 or more, Amazon charges the same with free shipping for Prime members. Under Armour UA Band Activity Tracker Store: Micro Center Price: $24.99 Shipping: In-store pickup Lowest By: $30 Some major retailers charge around $100 for this tracker, but you can score it for a quarter of that with this Editors' Choice deal. It offers similar features to higher-end models, including music control, alarm clock, sleep monitor, and phone notifications. It measures sleep, resting heart rate, steps, and workout intensity. It includes a case and is water resistant to 6.5 feet. Note: You can order a maximum of two units at this price; afterwards additional units cost $44.99 each. Mio Slice Activity Tracker Store: REI Price: $76.93 Shipping: Free shipping Lowest By: $52 This activity tracker uses "Personal Activity Intelligence" to track your body's response to different exercises. It then provides personalized feedback and a score to determine how much activity you need. It tracks steps, distance, calories burned, sleep patterns and resting heart rate, remembers up to one week of activity, and is compatible with Android or iOS. It's available in sizes S/M or L/XL.