Pick your module each one has their own price.  Check the drop down menu for price on each book or module and availability.  You get 1 item per order not everything.  

Hackmaster 4e are adaptations of classic AD&D modules updated into more modern system. 

Most books are in excellent shape, though here are some of the notes on others:

Hacklopedia of Beasts Volume 2 and 3 has some moisture damage and is a good table copy NOT a collectible hence the price is low.  You might not be able to see that on the picture.  The damage is throughout the book from cover to cover.  Priced lower due to condition.

CS7