I'm not sure why we ever actually buy toys for our kids.
Costco boxes are great.
Even my seven-year old joined in. They each fit into a box and pretended they were sailing in pirate ships - for at least an hour.
And then they fought for an hour about whose boat was whose and tried to sabotage each others' ships.
That's much longer than they have ever played with a toy we've paid for.
A trip to Costco is somehow always expensive though... maybe included is the cost of increasing a mother's sanity due to the extra entertainment provided by the boxes upon arriving home.