I've had a few people asking where I'm getting the cones for our courses.
Bellow is the link to e-bay seller who has them in different colors. You specify which color you want at the checkout with a "note to seller". They also do 25/25 split of two colors if you want.
Please note, that I'm not affiliated with the seller, and I'm just sharing where I get my cones.
Also note, that these cones are not the official cones that are used in Japanese, UK and Alabama events. However they are proven to be excellent cones for our NYC purposes by being cheap, portable in large quantities, durable (been run over multiple times without cracking), and wind proof, so that they don't fly off or move with gusts of wind.