every month avon do a instant win comp and the prizes vary from month to month.
You can keep trying as many times as you want, but I do warn you it does get very frustrating, but it is worthwhile in the end when you get a prize delivered in a months time.
I have won 3 times so far.

good luck all

http://avonshop.co.uk/avonshop/default.asp?department=sweep