http://www.ebay.co.uk/itm/oculus-rift-dk2-/192085988520?hash=item2cb93794a8:g:DVwAAOSwA3dYhmxn
£130 no bids, 3 days left for a DK2. i know i know its a little old now but its a thought. It really is amazing
if it lasts you a year or whatever it may be worth it?
If you still have Cliffs of Dover, get Team Fusion mod for it, it transforms the sim and will be improved upon, free as well.
http://theairtacticalassaultgroup.com/forum/forumdisplay.php?f=91
Did anyone mention Rise of Flight? thats free as a core WW1 flight sim too with two or three aircraft to get you going and lots of DLC, would recommend WoFF UE as well if you like WW1, not free but outstanding, 25% off just now as well I think.