Analog to digital converter

dose any one know how or were i can get a cheap analog digital converter?

 

More info, please. What is

More info, please. What is the analog signal you are trying to convert? What’s the amplitude range? How about the speed?

You can just use an analog input of a micro (PICAXE, Arduino, etc) to convert a 0-5V level analog signal to a digital value. Is that all you need?