OnePlus has recently announced in its various forums that it will soon introduces invite-free handset, so there is chance that you can soon buy OnePlus 2 invite-free. This open sale will kick off form December 5, 2015, where you can buy OnePlus 2 and OnePlus X. The OnePlus X, however, will only be for this offer till December 7.
After this OnePlus X will only come on open sale once a week. The OEM confirms that all orders pace with December 7 will be shipped without any dealys till Christmas.
Apart from abandoning the invite sale, OnePlus will also offer covers and accessories of the OnePlus X on discount.