This Garmin Edge 500 Cycling GPS drops from $249.99 to $199.99 with this $50 mail-in rebate at Garmin. Add $8 for shipping. This is the lowest price we could find this cycling computer by $50. It measures your speed, distance, time, calories burned, altitude, climb and descent, has a battery life of up to 18 hours and can be paired with heart rate monitors for additional calorie computation and third party ANT+-enabled power meters. It's also received an average score of 4.3 out of 5 from 139 Amazon reviewers. Sales tax is charged in most states.