Your service light is flashing? That is BAD! Stop driving it and get it fixed. You are doing damage. Drive that car to autozone like a grandma and get it scanned and let us know what code or codes they find. Why all of a sudden are you asking about an EGR? You can take them off and clean the crud out, but that may not be your issue. Again, flashing light is BAD and needs to be fixed NOW!
You can get a OEM EGR valve with gasket from amazon for $102 with free shipping.
EGR valve at Amazon