hi,
first tell me what ur budget is. the original ones are costly and the duplicate ones are cheap. ( i didnt see any difference in them).
then there is one with USB connection and other with serial Connection. (USB is faster, speed wise).
The USB one is for about 500 - 600 Rs. (duplicate).
the original ones are for about 1300 Rs (might have got cheaper)
if you cant find it in kutch. i can send you one if you want. i am from BHAVNAGAR (gujarat), thats not far from you. so the curior charges will be about 50 Rs. (I think)