These rock operas, collectively known as the "Christmas trilogy," remain perennial best sellers.

It is the old house, a perennial best seller.

Danielle Steel has been writing novels since 1973, and they are perennial best sellers.

The Sentra and Frontier are its perennial best sellers.

Take the Oldsmobile Achieva, a perennial poor seller with retail customers.

Their 1975 Greatest Hits album became a perennial seller and is now accredited at 4x platinum.

It is a perennial best seller on breaking and hip-hop media retail web sites.

Other perennial best sellers are card games, flight simulators and chess.

To make money, the industry depends on perennial sellers and on best sellers.