Waited until the last minute? You're in luck, because you can snag this year's top Christmas countdowns for as little as $9.

Lego is forever. Modern Lego sets include classic worlds like Lego City, franchise collaborations with beloved characters like Super Mario, and exciting new adventures in Lego Dreamzzz, where shark ships ply the skies.

This Black Friday, we're a little obsessed with Lego. And with so many great Black Friday deals on science and STEM-themed Lego sets — including the Botanicals range, nature-themed sets, animals, space and more — we wanted to share them with you.