I shopped at Cosco (North Lakes) with my partner for ourselves and one other family. Some of the items in there are really cheap, while others are the same (give or take a few dollars) as everywhere else.

We did save a bit of money by shopping there, but they again have to factor in driving all the way down from the Sunshine Coast. The staff are also incredibly rude and condescending, and seem to go out of their way to be as unhelpful as possible.

I don't think we'll go out of our way to go back. The extra hassle wasn't worth it for such poor service.

Costco will change the way you shop. Their customer service is excellent, their veggies fresher than any veggie store in QLD, and their meats? Less expensive than coleswollies and better quality too.
Only a family of two, but there are many things we buy in bulk, and we are saving about 100 a week on food/sundries.
Costco is geared towards the middle and upper class, and not every one will "get" the concept of bulk buying.
Australia needs more competition and Costco is just the group to do it.

I joined Costgo North Lakes when the store opened, there are so many bargains too many to mention. You have to be disciplined in buying as you can get caught up in the hype. Their vegetables are very fresh and last twice as long as the ones in other supermarkets. The strawberries are from Wamuran and taste delicious. i live close by and the petrol savings are fantastic we have 2 cars and we have saved our $60.00 in that alone. One question how can Woolies and Coles sell discounted petrol in this area but not anywhere else they are ripping us off. I now shop Costgo and Aldi don't need the others
Variety
Lack of zebra crossings in parking areas

Fuel bowsers only allow $20, $80 etc. selected $80 but car only took $70. So instead of reversing the $80 Costco took another $80 plus the $70 thus charging me $230 for $70 fuel. They refuse to acknowledge that they have made a mistake and will not refund the money. So much for cheap fuel.

Fuel works out to be about 4 times the price of anybody else. Staff are the rudest I have ever encountered

Some prices are cheaper and some more expensive, but you cant please everyone. A really great place to do all your shopping in the same place. Purchased some shoes at 70 % cheaper than leading shoe store. Friendly staff very helpful and going back tomorrow as it was a great first visit. Very Highly Recommend going there.
Everything in one building.