How much would this smartphone go down in price in a couple of months (estimate)?

[Sarah]

I'm getting the Htc Desire Z: http://www.amazon.co.uk/gp/product/B003ZDP5YU/ref=s9_simh_gw_p23_d0_i1?pf_rd_m=A3P5ROKL5A1OLE&pf _rd_s=center-2&pf_rd_r=1M32883EA409HWH6ZAN3&pf_rd_t=101&pf_rd_p =467128533&pf_rd_i=468294

Which as you can see is £400 now, a couple of days ago on Amazon UK it was £10 less than the price it is now though :/
I want to wait a few months so I can save up a bit and so the price can go down but how much do you think it would go down? Past £350?
I found it on another kinda-trustworthy-looking site and it was about £330. Would it be better to buy it on the other site now or Amazon later? Would I save money?

I'm going a bit crazy for a new phone after my old phone broke and I've been using a nokia brick. And I'm obsessed with this XD

Thanks in advance!
Answerer 2, I think I made it quite clear I want *this* phone. iPhones are terrible, and there is sufficient evidence to back that up. I even heard you can't take the battery out!! xD You're tied down to iTunes and they're not as powerful as most Android phones. And I'm not a sheep; I want a phone that's good, not one that has a flashy name.
And £500 straight in Job's pocket? No thank you.

[strawberries]

every major sale is on every six months end of financial year to get rid of stock and after christmas sales to get rid of excess stock !
so june/july and after christmas

[CocaCola4me]

I would think it will fall a great deal. With iPhone dominating Market sales for the smartphone customer. Why not just get an iPhone?