Credit card convenience checks almost always have an immediate 3% fee plus immediate grace period free interest. If it were me, I'd dip into my emergency stash.

The only alternative I could think of would be to go the Bluebird route, but that's limited to $5,000 per month and you'd have to so some questionable things like write and cash checks written to yourself--and you most certainly wouldn't be able to get it all done by next week.

Wish I had better advice, but I think your stuck paying cash--or high interest/fees.