I don't know if Delphi Classics are on sale or if some of the books (or all?) are usually this cheap. Here is the
Kobo Aus link, but don't worry if you're logged into another Kobo country the link should open in whatever country you're logged into.
Here's a sample of titles/prices:
Complete Works of Marcel Proust (Illustrated) AUD3.16
Complete Works of Anton Chekhov (Illustrated) $3.16
Complete Works of George Orwell (Illustrated) $4.21
Complete Works of William Shakespeare (Illustrated) 3.16
etc etc
Each of these books is discountable. See the Discounts thread for the codes.
Amazon Aus also has them, and for similar prices. So Amazon in your country may also.