Saw this one for sale today on Craigslist. Doesn't seem That bad, especially for $500.
https://boston.craigslist.org/nwb/cto/5868176192.html
"1968 Custom 10 (C-10) Suburban. 3-Door 9-passenger model. 2 WD.
Good for parts, very rusty. Restore if you really want challenge.
Bumpers, glass good, nose/tailgate OK.
Has original 327 4bbl engine w/4-speed trans. Engine was running last yr.
$500/BO"