For that price, I bet the Corydoras julii were actually Corydoras trilineatus. They look very similar. I've even seen them mixed in the same tank at a LFS.I'd say the Bronze Cory (Corydoras aeneus) $1.99-$3.99, the Julii Cory (Corydoras julii), and the Pygmy Cory (Corydoras pygmaeus) $.99-$1.49.