Now for sale at Amazon, Radioshack and Staples, 3D printers are getting less and less difficult to find. Home Depot became the latest retailer to offer 3D printers today when it began selling MakerBots online and in 12 stores nationwide. The store is selling three printer models, plus MakerBot’s 3D scanner and filament. The 12 stores are located in California, Illinois and New York. “Imagine a world where you can 3D print replacement parts and use 3D printing as an integral part of design and building work,” MakerBot CEO Bre Pettis said in a release.