Sam's Club currently has some Epic Lab Stem Kits for $9.98. Free store pickup, or free shipping for Plus Members.
Epic Lab Lunar Explorer, Model and Excavation STEM Kit
Epic Lab Make and Break Tester, Structural Engineering STEM Kit (Currently available in store only, so YMMV)
Epic Lab Human Anatomy, Clay Body Sculpting STEM Kit
Epic Lab Catapult Science Physics and Mechanics STEM Kit
Epic Lab Lunar Explorer, Model and Excavation STEM Kit
Epic Lab Make and Break Tester, Structural Engineering STEM Kit (Currently available in store only, so YMMV)
Epic Lab Human Anatomy, Clay Body Sculpting STEM Kit
Epic Lab Catapult Science Physics and Mechanics STEM Kit