Save up to 53% off STEM Toys and Kits The links in the post below may be affiliate links. Read the Full DisclosureNovember 8, 2021 by Kim Julian Today only, save up to 53% off STEM Toys and Kits for National STEM Day. Get this Melissa & Doug Wooden Alphabet Sound Puzzle on sale for $12.39 (Retail $21.49). Head over HERE to shop all of the deals.