Costco membership can be recouped in just one big item, so not really too big a deal. Costco is bulk - stuff like nappies, laundry etc would save you heaps (if you don't mind doing 1 big shop every 9 months) Can't beat Aldi for price, but range is limited, lines are out the door and brands aren't recognisable (they are generally good quality though) Coles is my go to for my weekly shop - Local IGA is too expensive, Aldi is too painful and Costco isn't local. If you can be bothered - maybe do Costco once every couple of months to stock up on stuff for the new born, stuff for the household, paper goods, bulk stuff etc Aldi every other week for the long life stuff - stock up on cans, pastas, stuff for the shelf etc Coles weekly for perishables - meat, fruit, veg, milk etc - stuff for the week ahead and stuff you've run out of inbetween Aldi shops. Pick up from Aldi the stuff you run out of between Costco trips. Personally - too hard for me - I just go to coles, but if you could cut your shopping bill in half it would make a huge difference to the motivation.