Listmania!
Great Fantasy You May Have Overlooked
By an Amazon.com customer
The Face in the FrostThe Face in the Frost by John Bellairs
Buy new: $10.17 / Used from: $12.95
An excellent story with a dash of humor that will entertain and surprise.  You will not be disappointed.
The Crystal Gryphon (Science Fiction Series)The Crystal Gryphon (Science Fiction Series) by Andre Norton
Buy used from: $0.99
One of Andre Norton's best.  This story is told from the rotating point of view of the two main characters.
The Mirror of Her Dreams (Mordant's Need)The Mirror of Her Dreams (Mordant's Need) by Stephen R. Donaldson
Buy used from: $0.01
Book 1 (of 2) of Mordant's Need.  Utterly engrossing.  Donaldon at his absolute best.
A Man Rides ThroughA Man Rides Through by Stephen R. Donaldson
Buy new: $11.53 / Used from: $4.60
Book 2 (of 2) of Mordant's Need. - A word of warning: not for the young.
Dragon Prince (Book 1)Dragon Prince (Book 1) by Melanie Rawn
Buy new: $8.99 / Used from: $0.01
The first of 6 oustanding novels.  This fantasy has something for everyone from action to romance to unique magic.  Lots of characters!  Read all 6.
Avaryan Rising: The Hall of the Mountain King, The Lady of Han-Gilen, A Fall of PrincesAvaryan Rising: The Hall of the Mountain King, The Lady of Han-Gilen, A Fall of Princes by Judith Tarr
Buy new: $16.46 / Used from: $1.99
The trilogy in a single volume.  Mirain is without question one of the very best fantasy characters ever.
The InitiateThe Initiate by Louise Cooper
Buy new: $11.70 / Used from: $10.66
Order and Chaos face off, with the fate of balance in the hands of Tarod.  The 1st of a trilogy.  Tarod is another great fantasy character.
Nemesis (Indigo, Book 1)Nemesis (Indigo, Book 1) by Louise Cooper
Buy used from: $47.22
The first of an 8 book series.  Indigo unleashes 6 demons and is sentenced to walk the earth until she can hunt them down and defeat each one.  Very hard to find series.  Find them and read them.
The Book of Three (Prydain Chronicles)The Book of Three (Prydain Chronicles) by Lloyd Alexander
Buy used from: $0.01
Taran the pigkeeper.  Don't be thrown off by this.  Over the course of the 5 book series Taran and his companions grow and change.  Based upon old Welsh mythology.
The Great Book of Amber: The Complete Amber Chronicles, 1-10 (Chronicles of Amber)The Great Book of Amber: The Complete Amber Chronicles, 1-10 (Chronicles of Amber) by Roger Zelazny
Buy new: $17.27 / Used from: $5.52
Amber is the only true reality.  Earth and everything else are but echoes of Amber.  All 10 books in one,  Inventive and captivating, with surprises popping up along the way.
Swords and Deviltry : Book 1 of the Adventures of Fafhrd and the Gray MouserSwords and Deviltry : Book 1 of the Adventures of Fafhrd and the Gray Mouser by Fritz Leiber
Buy used from: $10.85
Wizards, thieves, swords and non-stop fun.  Fafhrd and the Gray Mouser just can't stay out of trouble.  The first of many books.
The Dark Is Rising Sequence: Silver on the Tree; The Grey King; Greenwitch; The Dark Is Rising; and Over Sea, Under StoneThe Dark Is Rising Sequence: Silver on the Tree; The Grey King; Greenwitch; The Dark Is Rising; and Over Sea, Under Stone by Susan Cooper
Buy used from: $17.00
Excellent series steeped in Celtic and Welsh legend.  Wonderful stuff.
The BorrowersThe Borrowers by Mary Norton
Buy new: $5.95 / Used from: $0.01
If you haven't read them, do so immediately.  Read them to your children.
Mythago WoodMythago Wood by Robert Holdstock
Buy new: $10.17 / Used from: $2.91
A story of a wood where many myths and times intermingle.
Lavondyss: Journey to an Unknown RegionLavondyss: Journey to an Unknown Region by Robert Holdstock
Buy new: $18.89 / Used from: $0.60
The second Mythago book.  In some ways better than the first.