Scooby-Doo #109 -- I searched this one out because it features Scooby and the gang at Coney Island's Mermaid Parade! The story doesn't make much sense (six pages doesn't seem to be enough room to do a classic Scooby mystery), but it has nice art by Joe Staton (including a character who looks vaguely like Ariel).
They also had some beat-up old back issues for 50c, so i picked some up:
Life with Archie #226
Richie Rich & Casper #28
Sabrina the Teenage Witch #58
(Walt Disney) Uncle Scrooge #136
I'll talk more about some of these later....