$300 off the first 100 Contiki Europe bookings @ STA Travel
If your that way inclined, starting monday STA are giving $300 off to the first 100 bookings. You've got to book and deposit before 31st March and the other discounts and promo's will apply to the booking (early payment etc).
Booking needs to be on something 10 days or more so if you look at the prices of those sorts of bookings it comes out at about a 5% discount. Not huge but still - STA are generally reasonably priced and for $300 you could quite happily buy a London - Lisbon return flight from one of the cheapy flights sites and have spending money for three days.