The Volt that ate Christmas

So my once beloved now despised Volt has done it again. After waiting nearly a month for parts and finally getting my BECM badge completed at a cost of $2200 (out of warranty) my happy little car waited a week or so and started on its next badge of honor....The EGR valve hustle! I read the codes and sure enough its pretty much spot on. So with this new nightmare I was wondering a few things: 1. Is there a replacement part available and will there ever be? 2. What are these strange Chinese made EGR valves available on eBay and do they work? 3. What damage am I doing to the car by driving it? I drive mostly on battery but I have a couple of out of town trips planned. The related has fuse has not popped yet just the CEL. Thanks and Happy Holidays except you GM you can suck it.