Hello,
Most of the private colleges in Tamilnadu cost you a bomb , the average fees for all of them would be around 5,000,000, but if you get a seat under government quota in some colleges fees may be low as compared to management quota, I am mentioning some of the colleges.
This is an approximate estimate for these colleges in Tamil Nadu:-
1. The annual tuition fee for government quota seats ranges from Rs 2.85 lakh (Perundurai Medical College) to Rs 4 lakh (PSG Coimbatore and Dhanalakshmi Srinivasan Medical College).
The fee fixed for management quota seats is Rs 12.50 lakh at all self-financing medical colleges except Perundurai Medical College where the annual tuition fee for management quota seat is Rs 2.80 lakh. The fee for NRIs is Rs 23.50 lakhs.
2. Tuition fee for government quota seats in Karpaga Vinayaga Medical College, Tagore Medical College, Chennai Medical College Hospital and Research Centre (SRM) and Annapoorna Medical College and Hospital has been fixed at Rs 3.85 lakh.
3. At ESIC Medical College, Chennai, the fee for MBBS is Rs 24,000.
However, you can follow a link for better understanding
http://www.medicine.careers360.com/colleges/list-of-private-medical-colleges-in-tamil-nadu
Hope it helps