All the Special Effects dyes listed here cost 13.99 USD (Best price I could find online).
Click the 'Buy' button to be taken to the site you can buy the dye from. Also some colours glow under UV light
To find out the best brands to use, how to pre-bleach safely, the best way to maintain colours, how to separate colours and lots, lots more check out: 'ANY COLOUR OF THE RAINBOW The Ultimate Guide to Alternative Hair Colour!' By Anya Goy, Vidal Sassoon trained hair stylist.