The steelbook editions of pokemon omega ruby and alpha sapphire (including corresponding figures) have been out of stock for quite some time now, because of their great demand. These are selling on eBay for around £55, as they are limited edition and so are considered collectors items. Stock seems to have been replaced as I had checked relatively recently. If you just want the game, then you can easily sell the other bits for £25, making the game £15.
Hope this helps someone,