Originally Posted by
wrxmom
While it won't help you this year, you could get the US FlexPerks card for next year and get 3X for charitable donations.

Very good advice... a FlexPerks point is worth up to 2 cents, so it's really up to 6% back. (You could make an argument it's even higher, since FlexPerks airline tickets earn miles.)
Even if you add 2% or 3% to the donation amount to cover the charity's CC processing costs, you're still ahead.