I had a friend that worked at the now defunct Miller brewery in Fulton NY that brewed Meister Brau, their cheepo brand back in the day. He could get me cases for $5 with no 5 cent deposit so after returns it was $3.80 a case. Still not worth it. Horrible stuff.
About your cans. I agree it depends on how old and what kind of top. I had a sixer of unopened Billy Beer cans that were worth so little it was worth the effort to sell them.