Just looked at their twitter page (http://twitter.com/#!/oculus_vision) where they are advertising 30% off all frames! Prices only start at 8.99! meaning with the discount its only over £6.00 for a complete pair of prescription glasses!
Thats a Christmas bargain! Don't know how long the offers going to last! I've got mine ordered!
P.S use voucher code jinglebell2010 for the 30% off!