And Here is the best advice:
DONT do it yourself..I submitted my case by myself first...but then it was returned soon after I submitted it... something unexpected was missing in the documents and I never thought of submitting that document to CIC... its a really complicated case and the waiving off of interview is important...A lot of evidence is required...
The bottom line is: Time is more important than money. Your brother will easily earn that money in Canada in less than a month which he would spend on his wife's case. But once your case is stucked or something, your brother's whole marriage life will be ruined. So, dont do it yourself. You may go to some cheap lawyer but if you do it yourself, you will definitely forget something to submit and will your file returned back to you...
they are making it strict and strict now-a-days. God bless you in making your bhabhi to come to Canada !