My first post, so please be gentle.
This is for Egg Card holders only.
If you go through the Cashback Offers section on the Egg Card website, you can click through to CD WOW and 20% will be credited to your Egg Card once you have made your order.
You have to use the Egg link to CD WOW rather than through Quidco or the legendary Gary Rip's links, but the prices are still pretty decent.
Expires end of June, so be quick!