If you mean the amazon promotional codes, I have some suggestions:
Most of amazon promo codes would be released during the first week monthly, and you can find them from amazon special offers & promotion page or on the some famous coupon sites.
For amazon.com, my favorite site is amazon discount finder (http://unlockyourdollar.blogspot.com), because it can let you search secret discount besides the amazon promo codes lists. The most important thing is that it organizes all amazon promotional claim codes by category, and easy to search and use.
Other coupon site such as retailmenot.com and dealsea.com are all good.
Final method : Google.
Good luck.
Here are more coupon sites:
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http://www.hotcouponscodes.com
https://couponsheap.com
http://www.couponuncle.com
http://www.couponsok.com
https://www.ediscountshopping.com
http://www.travelmaxi.com/
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