How much does it cost to fix/replace a skylight?

All depends on where you live. Understand, you may have shingle/roof repair, possible rot repair, and interior wall/ceiling repair. Also keep in mind, you get what you pay for. Get at least three quotes from local contractors. Check with your local lumber yard for references and decent contractors in your area. Always check for lic. and insurance, and ask them what their warranty's are. Most ociations from where i live make the homeowner pay for anything not viewable to the public eye. Yes, i have seen three different types of shingles mingled together on one continuous roof- absurd!