Look in the For Sale Forum for a Vortex Member who is parting out a car. Airbags aren't worth much because it's illegal to ship them by most carriers, expensive to ship when you can find someone willing to deliver them, and there are lots of airbags available.
You should be able to get the two airbags for $50-$100. Make sure you get the airbag controlled from the same car if possible. You are supposed to replace the airbag controller when the bags are deployed. It's a little harder to find a good passenger airbag cover, because they are made to split, and often times they split even when the airbag doesn't deploy.
I have what you need, but no way to get it to you (that shipping problem).
Make sure the car is really repairable before you start sinking money into replacement parts.