Today is the final day of Prime Day, but that hasn't stopped Amazon from releasing another deal on an excellent LEGO set as a last hurrah. Right now you can pick up the LEGO Ideas Treehouse 21318 set for only $174.99. That's 42% off its $250 MSRP and the best price we've ever seen for this model since back in 2023. This is already an officially retired set, meaning this could potentially be the last deal we might ever see for it.30% Off LEGO Ideas Treehouse 21318 (Officially Retired)If you're familiar with the popular LEGO Bonsai kit, think of the Treehouse as a supersized version of it. This 3,036 piece set measures an impressive 14" x 10" x 9" and weighs in at over 8 pounds. This is a rather complex build that's intended for an older audience (16+). At first glance you might just see a majestic tree, but there's definitely more than meets the eye here. The fully landscaped base features a complete picnic setup next to a buildable stream. The treehouse itself is comprised of three separate cabins, each with removable rooftops and fully decorated interiors. There's even a windup crane for hauling goods up to the treetop. A full set of both green and yellow leaves are included to mimic your choice of season. And in keeping with the whole "green nature" aspect of this build, all the plant and tree elements are made of a renewable plant-based plastic as opposed to petroleum-based plastic.More LEGO Sets on Sale for Prime DayMighty Bowser isn't the only set currently on sale for Amazon Prime Day. Check out these other adult-themed sets from Walmart, Amazon, and even the LEGO Shop, including the Milk Way Galaxy, the LEGO Technic BMW M 1000 RR Motorcycle or the LEGO Icons Land Rover Classic Defender 90, which is expected to be retired later this year.Why Should You Trust IGN's Deals Team?IGN's deals team has a combined 30+ years of experience finding the best discounts in gaming, tech, and just about every other category. We don't try to trick our readers into buying things they don't need at prices that aren't worth buying something at. Our ultimate goal is to surface the best possible deals from brands we trust and our editorial team has personal experience with. You can check out our deals standards here for more information on our process, or keep up with the latest deals we find on IGN's Deals account on Twitter.Eric Song is the IGN commerce manager in charge of finding the best gaming and tech deals every day. When Eric isn't hunting for deals for other people at work, he's hunting for deals for himself during his free time.