Lowes offers CRAFTSMAN TRADESTACK 22-in W x 33.6-in H x 18-in D Black Plastic Rolling Tool Box for $149 (reg. $209) with free shipping. 

Product Description:
Suitable for any outdoor job or project, the TRADESTACK™ 22-in Rolling Tower Premium Storage Stack includes a suitcase, deep toolbox, and a rolling unit. The TRADESTACK™ units connect to each other, automatically stacking via a drop and lock mechanism and easily separating with a one-touch release. They are IP65 dust and water resistant, have a large storage space to fit large and heavy tools, and feature durable 7-in wheels that enable smooth mobility for convenient transport to any destination. Compatible with VERSASTACK™ modules, and CRAFTSMAN® organizers and tool sets via an included adaptor, you will be ready to meet all your stackable storage needs. Made in USA with Global Materials.