where can i get MBBS seat for 300 marks neet 2019 obc cat with lowest cost

Hello student,
You have not mentioned which state you belong to. With 300 marks in obc category, it becomes difficult to secure a seat in the government medical colleges when comparing the results of previous years. It also depends on the state you choose. For example, With this score, you have chances of procuring a seat in the private medical colleges of Uttar Pradesh while it is not so in the case of states like TamilNadu for which the scores are extremely high even in private colleges. But, one thing to keep in mind is that scores and ranks vary each year with difficulty level of the question paper and availability of seats. However you can predict the colleges which you are likely to get using the given link
http://medicine.careers360.com/neet-college-predictor
Good luck