The three Isabella-written issues of Iron Fist have been collected in Iron Fist Epic Collection: The Fury of Iron Fist [Marvel; $39.99], a 528-page, full-color trade paperback.
Here's the Amazon pitch:
A Himalayan expedition to find the mystical city of K'un-Lun left nine-year-old Daniel Rand's parents dead, but he found the path to the K'un-Lun and there spent a decade training under its immortal inhabitants. He became an unmatched master of martial arts and spiritual control; armed with the shattering power of the iron fist, Daniel left immortality behind to set out into the Western world and avenge his parents' deaths. Packed with wall-to-wall kung fu action, Iron Fist runs a gauntlet through the Kara-Kai death cult, ninja adversaries, and mystic dimensions.
The book collects Marvel Premiere #15-25, Iron Fist #1-15 and Marvel Team-Up #63-64. The writers: Roy Thomas, Len Wein, Doug Moench, me and Chris Claremont. The artists: Gil Kane, Larry Hama, Arvell Jones, Pat Broderick and John Byrne. I remember liking these comic books a lot back in the day and I'm looking forward to rereading them soon.