I also have a few United certificates good for 2 people for $25-75 off fares from 50 US states to Hawaii using AMEX card.

I still have several CO discount certificates
good for $20-100 off leisure fares (except Q)and $40-$100 off business fares (Y or H)
as well as numerous car rental upgrades, free days, etc.

Please email me if interest. I'm looking for AA and UA discount, companion, upgrade certificates, etc.

THanks,