Here are puzzles I would like to own but do not. They range from way too expensive, to possibly obtainable.

Regatta	Zookeepers Nightmare - Smartgames	Slocum and Botermans have a new puzzle book out - so far, only in the Netherlands - Het Ultieme Puzzelboek
Also from Family Games, some new tanglements from their IQ Collection: Sproing, and Mental Maneuver.
Two new tanglements from Livewire: Paper Clip and Aftermath; and one new one from Uncle's Puzzles - Cuffed.
Catch of the Day - designed by Doug Engel Bits and Pieces has it.	Two Sliding Squares - designed by Serhiy Grabarchuk Bits and Pieces has it.	Transposer Tiffany - faze3 in the UK has it.
The World's Toughest Puzzle	Any or all of the Circle Puzzles, such as the Hayride, from Doug Engel's Puzzleatomic	AreYouGame has Knight's Move
Temple Games produces Brain Art Level 4, Infinity, and Triangular. (links to cardhaus.com)	Game Birds by Pentaplex	The Toe-Key-Yo and Hel-Sin-Key by Rocky Chiaro
The Pattern Box by Kagen Schaefer	Cube 2006, Ivan Cube - by Leonid Mochalov - available from Puzzlewood.de	TanCube - available from Puzzlewood.de

Over the years, there have been many variations on the Rubik's Cube type puzzle where elements held within the puzzle can be rearranged. There are also custom versions made by enthusiasts, some of which (both the person and the item) have become well-known in the puzzle collecting community. The table below shows some of the items I will add to my collection as serendipity permits.

Tony Fisher's Golden Cube A Skewb mod - uniform color, but every piece is different.	Meier-Halpern Pyramid Ton Dennenbroek's site has building info.	Trajber's Octahedron This is actually a cube mod, but every piece must be changed. The 4-part tips were the centers, the triangles were the corners. Can you visualize it?
Christoph's Magic Jewel A truncated octahedron. The original has decorations on the ends.	Pentangle Rotascope	Hanayama's "Insanity" version FOUND IT
Octaminx (I might make one.)	Uriblock	Mozaika FOUND IT

Stewart Coffin - Triangular Prism

Hesperides

Arjeu CT 752

Dalloz 184

From Davan's, a Maruca: 

a Lateral Thinking: 

From Funagain.com,

Criss Cross  

a 35-ball Pyramystery

Here are the relatively expensive items:

FromGarE Maxton:

A set of Hoffman's puzzle repros from John Berkeley