if you have a dealer nearby they might be willing to give you your radio code. there's no generic code, so you'll have to get the one for your radio.
while i was at a dealer last year they went ahead and printed out the radio code and other numbers for my car. i hear some dealers have no problem doing this and others refuse to do it. hit or miss.
if all else fails you might try contacting becker directly, but they apparently charge $20 for "research" fees. once you get the number, write it down and store it.
becker's radio code request page