Maxis is the only Telco that sell OnePlus One and the price with contract has cut down from RM 859 to RM 599 with new MaxisONE Plan.
The previous plan offered 2GB + 1GB data with a commitment of RM 158/month and the phone price is RM 859.
The new plan offers much greater deal by lesser 1GB data. It has lower monthly commitment; RM 128/month and you can get the device for only RM 599.
Source: Maxis Store