Usually a dropout can be replaced or repaired but can't say for sure without seeing it and usually not cheap. Where are you located as someone here may have a shop near you that can give an estimate. If you're near Arlington, Wisconsin this place has a good reputation at very reasonable prices.
Bicycle Frame Repair- Aluminum (yellowjersey.org) or send them a photo to get an idea of cost. Don't be put off by the 90's style website.