The best discount code for sls3.com is GIFT15, which offers a 15% off. There are also other codes such as ME10 and ME15 which provide up to 10% and 15% off respectively. Another code, LASH, gives 60% off on select styles. The code 2023 offers $40 off on selected products. Lastly, the code 0NOW provides a 50% discount for all Sls3 purchases. Please note that these codes may have expiration dates and terms and conditions may apply. It's recommended to check sls3.com for the most current and valid codes.