See the text box at the top right? The one next to a magnifying glass? If you didn't notice, that's the thread search. If you search for "burner", it will direct you to the appropriate threads.
I recently had to get a new one and pretty much this is the process:
1)Go to a store that sells one of the one. Feel free to shop around but pretty much any London Drugs, Best Buy, etc. will sell you one.
2) Once there, ask for an unlocked pre-paid phone. If they bother to ask you why, make it up: Tell them it is for a friend from a 3rd world country visiting or something on those lines. To make things even less trace-able, pay cash.
3) Once you have the phone, inquire about the plans and get the SIM card associated to the carrier. 7-11 SpeakOut has been a popular option mentioned several times. As several people have pointed out, you don't really need data, only voice and text. If you really need data, walk close to a Starbucks and piggyback on their wi-fi.