Just noticed today a range of cheap gearhead motors with various rpms. Here's one for example: http://www.dealextreme.com/p/high-torque-80rpm-12v-dc-geared-motor-91628 The rpms are 5, 10, 15, 30, 60 and 80. Prices are from US$8.30 to US$8.50. They claim to be 'high torque', but that's a relative term... Best wishes, Andrew