Application prices are mostly SR 35,000 but can be lower. The prices start at 2000 if they are via UpWork.
However, if you got the code, you wouldn’t face the problem of not having someone to fix it because having the code means that anybody can fix it.
You can do it depending on the country. For example, in Bahrain, if the application is not complex, prices start from SR 10,000 and maintain it 15% per year.