We have seen this question posted so many times, it is just not funny.
Other variations of this question are:
Where can I buy Bicycle Cards in Sydney? Where can I buy Bicycle Cards in Melbourne? Where can I buy Bicycle Cards in Adelaide?
Just replace the city above with the city or suburb in which you live.
The answer is that in most Major cities, you are bound to find a magic store which sells bicycle playing cards. So if you don't mind going into the city for a couple of hours because you want a nice day out, then use the yellow pages or google to find your nearest bricks and mortar magic store.
However, if you prefer the convenience of 'service to your door', then the we have listed a few links below for pleasure:
a single red deck of bicycle playing cards is $6.60 and you can click here to add to your cart
a single blue deck of bicycle playing cards is $6.60 and you can click here to add to your cart