You might want to look at HTI Replacement motors here http://www.robotcombat.com/marketplace_motorsmisc.htmlhttp://www.robotcombat.com/marketplace_motorsmisc.html cheap, but youd have to pay the postage from the US

A few of these maybe? (three might just do) http://www.distel.co.uk/asps/details.asp?ID=38018PT18&ER=0.5475&CY=USD&AP=32.88http://www.distel.co.uk/asps/details...Y=USD&AP=32.88