It differs every year is not fixed.its like early bird gets a medical seat in a cheap rate.Some of the cheap payment medical colleges are the following below:

1.madha medical college

2.annaporna medical college & hospital

3.a.c.s medical college

4.dhanalakshmi srinivasan medical college

5.vinayaka missions kirupananda variyar

6.sree balaji medical college & hospital

7.sree mookambika institute of medical science

8.melmaruvathur adhiparasakthi institute of medical science & research

9.sri Satya sai medical college

10.saveetha medical college & hospital

11.karpaga vinayaga institute of medical science & research centre

12.meenakshi medical college

13.Chennai medical college

14.sri muthukumaran medical college

15.Rajah Muthiah Medical College

16.chettinad hospital and research institute.

Try in all these colleges.

Thank you and all the best...!!!