Adidas has these sales often but it's only best when they do a store wide sale at 40% or more.
This is only for selected factory outlets and adicentre but these are where you will find real savings anyway. Previously I've purchased soccer jerseys for $25 each (RRP $139) or top of the range soccer boots for around $100 (RRP over $300). Not likely to find something specific that you have been looking for but if you go there with an open mind (and an open wallet) then you might find some awesome bargains. Get in quick though as sizes and style do run out quickly.
2 Days only - This Thursday & Friday.
By the way, here's a screen-grab of my email from adidas with the store lists:
http://upload.ozbargain.com/2011/09/27/6800_adidas.jpg
Mod: Fixed URL
Did you get a Chelsea jersey?