If you are in advanced reseller mode (card listed at $9.50) a 30% off offer would be $6.65
If you are in simplified mode (card listed at $9.75 due to .25c s/h added) a 30% off offer would make the card $6.90 (I think thats how it works with S/H staying same)
Just put a smaller number in the offer field (like $1) and it will come up with "Minimum offer is $x.xx), just put that in and I will accept if you are happy with the price