I noticed yesterday that Noble Knight Games now has Holmes' novel The Maze of Peril in stock (11 8 3 1 0 15 9 copies as of 11/26/12) for $9.95 plus shipping. NK presumably ordered these from the publisher, Space and Time in NY, who still sells copies of the original 1986 printing. S & T charges only $6.95 + $1.50 shipping, but requires a check or money order, so you may find it more convenient to order from NK, who take PayPal, credit cards, etc.
If you are not familiar with the novel, it's a 150-page OD&D-ish adventure featuring the duo Boinger the Halfling and Zereth the Elf, who had earlier appeared in Holmes' three short stories for Dragon Magazine - though Maze of Peril is set earlier, as the pair meet for the first time in the beginning.
A few reviews of the book:
A lone review on Amazon (1998)
Dragonsfoot review (2006) - by myself, points out the many similarities with Holmes Basic
OD&D Discussion thread (2008)
Carjacked Seraphim review (2010)
Delta's D&D Hotspot review (2011)
And here's the NK blurb:
"To those with the courage and ability to survive, the maze pays equal
tribute in its fabulous mysteries and treasures from countless
civilizations. Now the Dagonites plot to keep these riches for
themselves. Boinger the halfling and his companions must discover the
Dagonite stronghold, challenge their warriors and wizards, rescue a
friend, preserve the waterways of Amazonia, and maybe even save the
world. [this portion is taken from the back cover of the book]
Inspired by Dungeons & Dragons and written by Dr. John Eric Holmes who was the editor of the basic set blue book which is generally referred to as the "Holmes Basic" and is widely considered to be the best set of rules for introducing a new player to the original D&D rules. By his own words, Mr. Holmes stated that he was rather upset after reading the original small books from the first box set and he still had no idea how to play the game. Because of this he spoke with Gary Gygax and offered to rewrite the rules into a form that would be good for beginners and Gary readily agreed."
Inspired by Dungeons & Dragons and written by Dr. John Eric Holmes who was the editor of the basic set blue book which is generally referred to as the "Holmes Basic" and is widely considered to be the best set of rules for introducing a new player to the original D&D rules. By his own words, Mr. Holmes stated that he was rather upset after reading the original small books from the first box set and he still had no idea how to play the game. Because of this he spoke with Gary Gygax and offered to rewrite the rules into a form that would be good for beginners and Gary readily agreed."