SAVE $40 : As of May 14, the Garmin Vivofit Jr. 3 is on sale for only $49.99 at Amazon — just in time for summer break. That's a saving of $40 and its best price on record. $49.99 at Amazon $89.99 Save $40.00 It's easy for kids to rack up those screen time hours once school lets out for the summer. But a fitness tracker can help balance those hours with some necessary movement and one of our favorites designed for kids is on sale for its best price ever. As of May 14, the Garmin Vivofit Jr. 3 (Marvel Black Panter edition) is on sale for just $49.99 at Amazon. That's 44% or $40 off its list price of $89.99 and its lowest price on record by a long shot. Mashable Deals By signing up, you agree to receive recurring automated SMS marketing messages from Mashable Deals at the number provided. Msg and data rates may apply. Up to 2 messages/day. Reply STOP to opt out, HELP for help. Consent is not a condition of purchase. See our Privacy Policy and Terms of Use . The Garmin Vivofit Jr.…