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If it's their first time living out of home I'd put together a washing basket with lots of every day items like a whisk, pegs, etc.
Nice wine glasses, platter/fruit or salad bowl, good fry pan, cutlery set, dinner set, coffee mugs, nice candle (ecoya or similar)
Do a gift basket with bits and pieces in it, i gifted a friend a box with foil, cling wrap, dish washing liquid, flavoured coffee sachets, laundry liquid, cloths, candles etc
I moved out just before my 20th and had a combined house warming and 20th birthday party.
Id say a kmart voucher.
Unless you do want to spend abit kitchenwarehouse and others often have really awesome discounts on good brand pots and knives
Gift card so they can buy their own stuff - if you know where they are keen to shop you can get a gift card for there eg. Ikea, super amart or Coles/Myers or woollies. I also like the washing basket hamper idea - I'd throw in a box of chokkies and about of wine or sparkly 😊