Where do you get shift codes?

Related questions

1. What do shift codes do in Borderlands 2?
2. How do I sign up for shift Borderlands 2?
3. What is a SHiFT account Borderlands 2?
4. How do I activate Shift Codes for Borderlands 2?
5. What is a SHiFT account?
6. Where do I enter SHiFT codes for Borderlands The Pre Sequel?
7. What is Gearbox SHiFT?
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9. Are shift codes free?
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Tags

1. #redeemed
2. #click
3. #digit
4. #extras
5. #codes
6. #shift
7. #bottom
8. #window
9. #paste
10. #previously
11. #borderlands
12. #button