Big W Joondalup manager Phil Miller said it took a week to put together the 3500 products, including helium balloons, in the back corner of the store.
"It was a big job to pull the shop apart and get it all in," he said.
"We are hoping to become the destination for all things party in the northern corridor."
PerthNow Digital Edition.
Your local paper, whenever you want it.Get in front of tomorrow's news for FREE
Journalism for the curious Australian across politics, business, culture and opinion.
READ NOWShopper Margaret Lydon, of Kingsley, said the party section was "such a good idea".