April 21, 2016 by: Dacia Daly41% Off Select Celestron Telescopes and Binoculars! Today, April 21 only, you can score up to 41% off select Celestron telescopes and binoculars. One nice deal we spotted are these Celestron SkyMaster Giant 15×70 Binoculars with Tripod Adapter on sale for just $53.99 (reg. $85.99!).