I used 123Passportphoto first time and it was very easy to use. 3 steps and within a minute you have your passport size photos ready. You can just copy them in CD and print at 40 cents at any drug store.
I live in NYC and usually pay $15 for 2 passport size photos at Walgreen/CVS but now i can have as many photos as i want just for $2.99.
I will highly recommend it.