Demon Tweeks sell them aswell but they are the same price so I doubt you'll get them much cheaper. Ford use them as standard equipment, can recommend them as they'll take a lot of abuse before they'll let you get the wheels off, that comes from experience, don't lose the locking key! Im sure I've got a set at work, but Im not sure if they'll fit Subaru wheels. I'll check tomorrow and let you know.
Deas