I took the drawers out of mine to move it up to my second floor (home office) and think I remember seeing just four wood screws in each of the corners up through the sheet metal top.
Home Depot currently has a Husky 46" one for $199 (50% off). It is actually called a lower workbench as it comes with a wood top, but could be used a lower tool chest too.
http://www.homedepot.com/p/Husky-46-in-9-Drawer-Mobile-Workbench-with-Solid-Wood-Top-Black-HOTC4609B11M/206842295