This is not a contest from me but from the African Robotics Network (AFRON). This association aims to popularize robotics in Africa as an educational way so they hold this contest.
The goal is to design robots that costs less than 10$ and that can be used for educationnal purposes. There are three categories depending on the fact the processing unit is embedded or not. The 9 Best projects will be awarded.
More informations there : http://robotics-africa.org/design_challenge.html
AFRON has been founded by :
Ayorkor Korsah, Asst. Professor, Computer Science, Ashesi University, Accra, Ghana
Ken Goldberg, Professor, IEOR, EECS, Information, UC Berkeley