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Green Kid Crafts is $19.95 a month + $4 shipping. Less if you sign up longer. Each Box contains 4-8 Creativity and STEM Science Kits, extension activities, and free online extras. They have a box for ages 2-4 & a box for ages 5-10+
Use code GET3FREE for and recieve 3 months free with a 12 month Subscription. It takes $59.85 off the total!
You can check out the options here.