Went in my local Asda today and saw they have this at £14.97 (and online I see it is £13.93 with free delivery for the Nintendo DS
This is the first of the Hamsterz games which I understand gets the player into the action quicker and has 'talking hamsters' (whatever next !) whereas Hamsterz 2 allows your hamster to have babies (joy ?!)
Still, this is quite a bit cheaper than anywhere else I have seen (having been looking for this for my child!). I know Game have Hamsterz 2 @ £30 as a BOGOF but it does need you to buy a second game if this is all you want.