As it pertains to Brasil.......you do not need an actual ticket in my experience to accomplish this.......I've got 21 trips there over the last 7 years.......

An itinerary page from an airline website will do.....or an itinerary from a TA....you don't actually need to buy the ticket per say.

Input everything and print out the page with all the details of the booking you want from the page before you are supposed to pay.....and then close the website without paying. That will work. I have done that 3 times over the last 7 years when applying for a visa. You will probably get a 90 day visa the first time.......and if you go back the second or third time you will get a 5 year visa like I have.

They do not care what flight you go out on, or if you travel on that specific flight actually. They just want to see evidence of a ticket.