Newbie questions - main one - how cheap can a bot be? Advice please. :)

[Rapidrory]

You can get those servos even cheaper here: http://www.aliexpress.com/item/Tower...995280250.html
I bought a load a while back and they work just fine.

If you can hack them to continuous rotation then you can get a full drive system for £2 a robot, albeit a bit slow. Would then just need battery, transmitter and receiver assuming you made the wheels yourself.

Cheap2.4GHz transmitters: http://www.ebay.co.uk/itm/Blade-Heli...item35c2d32ee2

Cheap2.4GHz Recievers: http://www.lemon-rx.com/shop/index.p...&product_id=92

Cheap antweight motors: http://www.aliexpress.com/item/N20-D...255308477.html

Cheap wheels for the motors: http://www.aliexpress.com/item/Whole...864343611.html

I build competitive antweights for about £16-£20 each (as such I have ~15 of them now), but I only have one or two transmitter for the lot, and I make all the electronics myself. If you used the hacked servo boards to drive the gear motors then you'd get about the same price per bot, and if you just used the hacked servos, you'd get even lower.