You can buy stock options close to expiry if you have sufficient margin in your account. The margin required for holding an open position or buying a stock option increases as the contracts are close to expiry. To know more about the margin required details with respect to stock options as they come close to expiry click on this link.
Why is there a mismatch of profit and loss and the quantity of my open positions on InstaTrade and the Neo App/Web?
When I have squared off my positions, why are they still reflecting as an open positions on InstaTrade?
Why was the InstaTrade square-off order rejected?
If I modify or cancel my InstaTrade orders from the Neo App/Web, will it update on InstaTrade as well?