If we really want to read Bhagavad Gita we must master the art of contemplation (chintan), the only way to understand Bhagavad Gita. A literal reading of Bhagavad Gita is meaningless, nothing ever becomes clear. To reach the hidden underlying meaning of sacred texts our indulgence in contemplation (chintan) is an absolute must.
The original text of Bhagavad Gita is in Sanskrit but the original text of Bhagavad Gita in Sanskrit containing all 700 shlokas verses along with Hindi or English transliteration is available with Gita press, Gorakhpur, India. Gita press has an online bookstore also.
All major cities of India have a Gita press store. It is advisable is possible to go personally and select the edition, the translation or the commentary that suits our palate and thinking process.
As English is universal language the commentaries on Bhagavad Gita in English by authentic authors like Jayadayal Goyandka, Swami Ramsukhdas and Hanuman Prasad Poddar are available with Gita press, Gorakhpur, India.
All the publications of Gita press are highly subsidized. The commentary on Bhagavad Gita with original 700 shlokas verses and with English transliteration is available for mere $1 to $3. Most authentic commentaries on Bhagavad Gita and also 11 principal Upanishads by Adi Shankaracharya (an enlightened one) are also available.
Publications are available cheap but we need the determination to indulge in contemplation (chintan) all the time. Only then we can understand gist of Bhagavad Gita in totality.