Same as what zen said: Kijiji is awesome, as well as garage sales.

Make a list of what items you want, and put a max price on it that you'd pay for that item. I did this when I first opened up, and gave my mom and sister the list and they went to garage sales in their area when I went to them in my area. You'd be amazed at finding somethings for free, or next to nothing!

Great areas to go garage sale hunting is an adult neighbourhood. The grandparents there just want to get rid of the stuff! I found a wooden table and chairs set for $5 (originally around $120 in price), and a Radio Flyer tricycle for $5, it was barely used (original price is $80)!