Thermofitting trays are included in many of the teeth whitening kits sold by Advance Dental Health Supplies. For kits that do not include trays, or if you wish to purchase spares or to replace aged and damaged trays, you can purchase them individually. Full instructions are included. OUR PRICE AUD $3.50 each Even better value when purchased as a kit of 4 trays and protective case for only AUD $15 - see Thermofitting tray kit