Cheapest Airtel GPRS for Rs. 75/month- Plan Trick in Chennai & Tamil Nadu

All of us are aware that Airtel charges a costly Rs.98 for a month of GPRS generally. But most of us won't be needing the 2 gb that is bundled along with it .Sadly there is no other cheaper plan in Airtel for a month.In that case ,we can activate daily plan of Rs. 5 for GPRS for 50 mb with a validity of 2 days repeatedly. Thus, it would cost only Rs. 75 (15 times *5)for a month of Gprs with 750.mb data. You can also share any other similar tips or tricks to save money.