How about putting a 55 inside a 85 overpack drum? 2" of Refractory cement in the bottom and then fill up the sides, after putting in the pipe nipples for air vents.
I get measurements of 26" diameter and 37" high for overpack 85 gallon drums and Outside Bottom 21 3/16" Top 22 1/2" and Outside Heights Minimum 33 7/8 " Maximum 33 7/8 so working it right you could use either lid. Overpack drum I was quoted $134.15 plus GST Plus shipping. I'd get my kids to get it from Calgary to Edmonton and then pay the 95$ to ship to me, it would be cube price so I'd have it filled with charcoal or chunk wood. or someone with an empty pickup coming north from Edmonton I'd kick in for gas money.
I might yet. We'll see how the UDS stands up to the big drop in temps coming soon. Only hit -20C a few times so far and even un-insulated it has done well. I will have to get some pictures and a write up.