the fee for CSQ is 395 CA$ . But make sure you meet the eligibility criteria before filing an official application. Other than CSQ, you need to learn French (if you can not meet the requirement without it). Upon having a CSQ, you need to file an application for PR which cost 550 CA$. If you are granted PR visa, you have to pay 490 CA$ as processing for for right of permanent residency. There are additional cost for acquiring some documents like police certificate and medical etc.
To be on safe side, the minimum required amount for CSQ is around 2000 CA$, provided you do all the process by you own.
If you get some job offer, it will be quick and cheap.
By the way, all the information regarding cost of immigration are provided at the cic.gc.ca as well as Quebec immigration website. Pls spare some time to have a look.