Intrepid travel one day sale Sat 15th May - trips before 30th June @ 50% off - might be worth a look
Might be worth a look if the intrepid travel sort of trips are in your radar.
One day only - Sat the 15th. You need to call the call centre to make a booking but you can see whats available on the Go To Deal link.
The 50% off'ers are for Cambodia, Vietnam, Morocco, USA and China. Cross checking the normal Intrepid price they are actually offering 50% off but I suspect they will try to upsell like crazy when you call.
If you cant depart before 30th June there are a couple of later options but the discount is less (15% and 10%)