For the next hour... this "Gold Box" deal at Amazon.

The ultimate gift for a classical music lover, this is Mozart’s complete works in one deluxe box. It includes 170 CDs in custom sleeves. With no jewel cases, it’s a very compact set. Included a CD-ROM with liner notes, performance credits, and libretti.

That's a lot of Mozart!

The interpretations are quite alright. Not the best for each work, but definitely solid and well recorded. Brilliant Classic also have a "complete work" for Bach.