I'm writing a program for one of my teachers that is supposed to give users a survey. The program is written in Java because I feel that should be compatible with most PDA's(though it has barely been started and can be moved to another language). Does anyone have any recommendations for PDAs(or cellphones or small laptops) that could run Java programs on them? Ideally it should be fairly cheap since this survey could be given in shady neighborhoods.

The idea is that the interviewers can walk around and give this to people on their PDA or whatever I recommend that they buy.