Kiwico Subscription Coupon Code
I had not heard of Kiwico before, but my daughter asked to get one for her sister as a Christmas gift. When I checked out their website, I saw that they are running a sale right now. Coupon code is awesome, and it is for $7.95 for a box for the first month (Eureka and Maker crates are $11.95). For longer subscriptions, it is $13.33 per month, which ends up being 3 months for the price of 2. I got the monthly box, one Doodle and one Tinker, with the plan of cancelling before the second month. I was able to use the code twice so each box was $8, which seems like a great deal. They are currently free shipping with a guarantee arrival by Christmas.
https://www.kiwico.com/
ETA: Coupon code morewhoa for 40% off from their store.