I think the PSVR might have a little something to do with it.
The PSVR needs a PS4 camera to work, and although the Move controllers aren't a requirement, they seem like they would enhance the experience over the DualShock.
The increase in the sales of PS4 cameras is 975 per cent, while Move sales are up by 305 per cent. And let's not forget the PlayStation Move charging stations. Sales of that little gizmo are up by 346 per cent.
Luckily there don't appear to be any stock issues at the moment. The camera wasn't included in many PS4 bundles initially, so there's probably plenty to go around for now. Although if you are contemplating picking up the PSVR, you might want to nab a camera just in case. They're selling for £42.00 over at amazon.