Hi Nikosony,
Tesco or Asda is an even better suggestion.

Just got into work and there is a large Tesco up the road from here so i will go and have look in my lunch break.
So far I have completed all of the tutorials on the Serious Magic website for Ultra but as they say, the best way to learn is to do something yourself.
I have had to re-shoot my footage for the Digital Director contest and fortunately(

) a situation has come up where I need to film a part of my video using a green screen.
I`ll let you know how i get on with it (i`ll do some practice stuff first!!) and hopefully you will be able to see the results in my competition entry.
Cheers