Just bought these from a guy through Federation models. Each cycle is 1 & 3/4 of an inch long. You get them in "sticks" of 3 for $8, or 6 for $10. And I believe the price includes shipping, as I paid a total of $8 for mine.
I contatced the maker of the game tank kit, and he informed me that he is currently re-tooling the kit to make it lighter, and therefore, cheaper. He went on to inform em that he had plenty of the lighcycles that went with it lying around. He gave me a choice of three or six, so I picked 3. Now that I think about it, perhaps I should have gone with 6, 3 to go with the tank when he re-releases it, and three others for a seperate diorama.