12" cones at $12 a dozen, 4 dozen to the box from : Memphis Net and Twine I recomend a minimum order of at least 96. (8 dozen) We only use orange in the large size. We use them to mark corners on the races, both inner and outer depending on need. Good for guiding runner direction.
Or from Sator at $1.25 each from : Sator Soccer
The diffrence between the large 12" and the small 7" disks does not sound much on paper, but they are very diffrent in size, bulk and visibility.
The large 12" ones will stay put on a road when the wind blows. The small ones are light and a car passing at speed will blow them away.
The small 7" ones are good for marking the sides of the course, turnings not to take, marking a centerline between incoming and outgoing runners, but only on the stright bits. You want to use the big 12" ones on a corner, and use them frequently, every few feet.
I have used the small yellow ones like bread crums, marking the way for cross country runners to follow, they show up well, and stay put on grass. We sometimes use the small yellow ones to reinforce the guidance of the orange cones, filling in between the bigger orange cones. The alternating pattern of orange and yellow is visually striking and clearly marks the boundary between the course and out of bounds.
Small 7" cones: I have seen the small ones sold for as much as 1.50 each, but you can get them for 30c each in quantitys of 400 from: Sator Soccer
Get some of the deployment straps at the same time. http://satorsoccer.stores.yahoo.net/discconestrap.html
(We modify the deployment strap to make it work better. We make a loop that goes over the body, and the other end is held in one hand, while the other hand deploys or picks up.)