in the US take a look at Adafruit.
In the UK I've found Hobbytronics and in Germany (where I'm located in) the usual suspects are
Worldwide: Search for DS18B20 at ebay or for "DS18B20 Arduino" on google and you get a list of sources of supply for your country (with a lot of pictures and instructions to wire the sensor).
Maybe somebody can extend this list of mail order companies.
Edit: 22.10.2013 14:47h: Argh! Forgot to write "on google" in the sentence above.
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