Google Cardboard Headset
VR for mobile is much less expensive than the PC, mainly because the headsets for mobile are basically just plastic and the phone does all the work. For the best deal, search the open market (but of course width of your phone should be written in place of "5.5 inches"). Some take a very long time to arrive, so check the estimated arrival time and make sure you're fine with that.

Google Cardboard Headset
VR for mobile is much less expensive than the PC, mainly because the headsets for mobile are basically just plastic and the phone does all the work. For the best deal, search the open market (but of course width of your phone should be written in place of "5.5 inches"). Some take a very long time to arrive, so check the estimated arrival time and make sure you're fine with that.