My 'main' box is a 3 piece unit - the bottom and mid boxes are OLD snap on, a bonus/christmas gift from my first employer. My top box ia a 86 or vintage snap on, one of the first with ball bearing drawers. THEN it was about $700, but I got it used after it fell form a truck when a tech was moving from job to job - it was full of tools and literally rolled down teh street at 30 mph! A few scratches, but it works just fine. $200 i paid. So i got off cheap. I also got tired moving this beastly arrangement, so my last job was as a motocycle tech and i got a cheap craftman set (2 boxes for $169). You can definitely tell the difference in quality - lighter metal, drawers harder to move (loaded and empty).

Last job was at a Nissan dealer. The techs there were slowly moving to the BIG long boxes (6' long) with the suspension on the tires, etc. These boxes cost 5 or 6 grand and more! An empty box weighs 650 pounds! Ugh! Load that with tools and even if you have a fork truck you'll have to make two trips in a 1/2 to truck!