well I just looked for you I found 2 different programers hypertech $340.99 and a superchip $378.99 I dont know which is better but I was not happy with the hypertech I found them at performancecenter.com
they are for the 02 S10 pickup 4.3 I know if you buy the hypertech programmer and you want more then it gives you you have to send it in to get it reprogramed which costs more money I did the reprograming myself it wasnt easy to do had to write a program to read the programer and it wasnt worth the time it took there are places you can send your computer to get it reprogramed cost is about the same as if you buy a programer but they can do more then the programer can its somthing you might want to look into