Robot noises?

[to-my-wife.livejournal.com]

I'm making a soft toy robot (from Wee Wonderfuls) for a friend and I'd love to put a sound box inside it so that it makes a robot noise when you squeeze it (any mechanical or beeping noise would do!). You can get all sorts of noise/sound boxes at places like Build-A-Bear, but I can't for the life of me think where I'd get a robot-like one.

Can anyone help me out? I'm in the UK so websites would be great.

Thanks so much!