I'm almost done with my first welding cart that I've made. My previous welder came on a cart (Lincoln PT185) and then my Lincoln mig welder ended up getting the standard Harbor Freight blue universal cart.
This time around I wanted something beefy and custom. The frame is 1/8" wall 1" tubing that I got for almost free through a friend. The expanded and perforated sheet metal I picked up through work and the local scrap yard, so those were cheap as well. The wheels and drawer rollers (not installed yet) were the most expensive pieces to this cart yet.
Still on it's way are two aluminum outside frame panels to clean it up, and two drawers out of steel--both 16 gauge. These are going to be waterjet cut so they'll probably add up to be the most expensive pieces on it (aside from the welder). I'm hoping they're done in the next week or two so I can finish this project up.