WTB - rear wheel - shimano compatible

Today I totalled my rear wheel when a nail went through my tire, tube, and wheel... looks like I have two stems on my rear wheel.  I just looked at it and the rim is cracked big time, so I'm guessing the wheel is not safe to ride.

I am planning to buy a new Cervelo P2C in the very near future, and was nursing this beater of a bike for a bit longer while I wait for the funding.  Accordingly, I'm reluctant to go drop money on a new set of wheels when I'll be getting new stock wheels with my cervelo in the coming weeks or months.

Bottom line - anyone have a spare functional but never used rear wheel they would part with for cheap?  Needs to be 700c and shimano compatible.  Even better if you can ship immediately or if you are local to the maryland/DC/virginia area.  I'm a hair over 200 lbs if that impacts whether you think you have the right wheel.

Thanks for considering.

Josh