Yeah the Sales Assistants are really of much help. When we went at midnight yesterday, I couldn't find Jetwing Primes and The Ark too and my friend asked one of the Sales assistants. He walked off somewhere having to ask others as well! In the end we found it ourselves amongst other clothes.
On another note, just came back from Forest Hill Big W, couldn't find the Jetwing Primes at all. But they did have The Arks, few sky hammers and heaps of Primes. No more shockwaves, when I picked him up on 5.30pm Wed, there was only about 4 left. Though they did have Deluxes Thundercracker and Barricade, which I haven't seen at other places yet.