It will almost definitely come back for pre order. A lot of the chatter has died down so subscribe to this thread and you'll get an email when pre orders go back on.
to get your Wall-E Steelbook 
Suppose if there were any legal ramifications in performing such an act, Zavvi would of consulted their legal team before offering it, so suppose you're totally correct in your answer.
Yep this E-mail just popped into my box too as I was clearing out spam, sold out!!! unless your prepared to give us £41.99Zavvi's email >
Last Chance
RETRO ZBOX AND WALL-E STEELBOOK BUNDLE Final 100, don’t miss out!
in which case it is in stock...
In this case, I don't think so, I've come across this many time's in retail, ie if you want the desired product then you have to buy the c*ap as well, don't get me wrong I think it is ridiculous but most retailer's will put offer's on like this and give us the 'consumer's' the choice to buy it or not. Where they fall down for me is forging stock quantities, take Guardians of the Galaxy it 'sold out' and when people asked for replacement's for damaged copies they were refused on the basis that it had sold out, only for it to reappear at a later date for £49.99!!!!! the only way to stop the Z-box/Steelbook package deal from becoming common is simply not to buy it....
Yep that's the wall-E-mail for all the wall-E's buying it!Yep this E-mail just popped into my box too as I was clearing out spam, sold out!!! unless your prepared to give us £41.99
As much as I hate Zavvi doing this, I should certainly hope there are no laws against that. Though I would like a refund on pretty much everything but the mousepad from the Guardians Zbox if that were the case that you could pick and choose what you want
legal? probably. ethical- no. you either choose to buy it knowing you are being exploited, or just dont buy it
