If you missed out on the PlayStation VR pre-orders earlier this year, you will have one last chance starting tomorrow. From the Official PlayStation Blog:
UPDATE (June 29, 2016): As promised, we’re opening our summer wave of PS VR pre-orders starting Thursday, June 30 at 7:00 AM Pacific on GameStop.com. Supplies are limited, and this is your final chance to pre-order. If you miss out, we will have product available in retail stores nationwide at launch.
So get your wallets ready, and bookmark GameStop’s PlayStation VR page, and get ready to pre-order the headset tomorrow at 7:00 AM Pacific (10:00 AM Eastern). Good luck!!
— PlayStation (@PlayStation) June 29, 2016