Where do I get an Oyster Card from?

I'll be travelling from LGW on the London Gatwick Express. Once I'm at Victoria, which way do I go to find a place that sells the Oyster card? Can someone be specific as to location? Being a visitor, I realize I could get a regular Travelcard, but I...

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I'm going to London next week and I would like to know what kind of shops you can get Oyster cards from. I can't buy one off the internet, so I need to know a shop. Thank you!

Can I get the deposit back as well? I am visiting London for a week.

i want to send off my application form for my 16+ oyster card, yes i am 16 as of December 1, but i'm worried that my current oyster card might get cancelled before my new one arrives and i live quite far from school so i need to get the bus every day...

ive sent off for my new 11 - 15 oyster card and it should arrive in 2 weeks in the mean time can i use the other half of the application and the receipt stappled to it as a replacement till my oyster card arrives?

It took like three days for my application form to come, does that mean, my actuall oyster card will come in three days? BTW only Londoners will get me xD would love an answer x

I cannot get a 16+ photocard at the moment as you cannot buy them until september, I need an oyster card as It is a lot cheaper for me to travel by bus with the oyster fares. Is it possible for me to get a normal (adult) oyster card?

I am traveling with a friend in London for 5 days. We want to do some sightseeing, so we thought we would get a London pass: http://www.londonpass.com/?aid=34&gclid=CKqz1KLkk68CFULN3wodDg2wyA And we are thinking about getting the 3 day pass with...