Here is my $0 UDS. Well I do have $ Into a whole quart of high temp paint. It was a whim and a challange during a family get together. Free drum that was going to be a trash burn barrel, speaker magnet on bottom side 2" bung to control air inlet, metal milk crate as charcoal basket, random grill grate from the camp fire pit that happened to fit, some bolts to hold the grill and others for Handles on the lid, and a 2" scrap pipe stack out the top. I made some killer ribs that weekend, and have made more ribs, an awesome corned beef brisket, chicken, thanksgiving turkey, and pork butt. Did I mention the cost?!
This pic includes upgrades of paint, the only cost, and an inlet pipe with flapper-damper to replace the speaker magnet that now helps position the cheap kitchen probe thermometer.
Now I need to make one small enough for camping.