My last budget reno materials went like this.
Kitchen floor tiles= gumtree - 2 cartons of carona
900mm freestanding oven, 2 years old= ebay- $300
Bathroom/laundry wall and floor tiles= surplus auctions- cheap $8ish sqm
Laminate floor= surplus auctions - cheap again but cant remember exactly
Plus lots of other bargains along the way, we weren't in any rush though so just picked them up as they came our way.