MaxiContainer on Middlebelt in Romulus sells 55 gal barrels. I've bought used barrels with a liner for ~$27, and new unlined barrels for ~$65.
I've seen the CL ad for the guy in Clarkston; if I lived closer to him I'd check those out, but Romulus was closer.
*** Bubba sez: A Bad Day Smokin' Beats a Good Day at the Office! - UDS, 26.75 OTS, EP-330, 18.5 WSM