They are still not hitting the shops in any great numbers so you will just have to either keep trying your local shops in the hope that you are there when they have just had a delivery or try checking this site out regularly http://www.wiigamereviews.co.uk/wii_stock.aspx
try calling your local woolworths and ask how often they are getting deliveries in. you may find that such stores havnt got quite as long a waiting list for the wii and are getting stock all the time.
I ordered mine 2 weeks before release date and got it 3 days after the release from there so im sure they must be better than many suppliers.