Update: Doctor of Credit has compiled a great list of targeted offers that includes many other banks. Check it out.
Credit card companies sometimes mail targeted offers for extra sign up bonus points or for extra spending. Targeted offers usually come with an invitation code so that they can only be used once and not passed around the internet.
If you lost your targeted offer or maybe you never saw it, you can check Chase's website and see if you have any targeted offers waiting for you.
The link for targeted offers is here. I checked and I had no offers, but maybe you will have better luck.