I have listed the most common additional schedules, but there are many. Any of the following will increase your cost and will be requested to be paid prior to filing:
Moving expenses - $25 - $100 depending on complexity
Travel/mileage expenses - $25 - $100 depending on complexity
Significant investment income $25 - $200 depending on complexity
Significant RRSP contributions - $25 - $200 depending on complexity
DTC claims - $25