gear4con
Just preparing for a Eurotrip and needed a Travel Pack. Ended up going with Black Wolf Grand Teton.
A quick Google search when checking out lead to the above 5% discount code that was posted in 2008 but is still active today.
YHA.com.au Members also receive a 5% discount. The code is 'yhamember' and it appears you don't need to be a member to use this one. http://www.yha.com.au/membership/discounts/region-discounts/
One cannot be sure about whether they do actually check to confirm if you are in fact a member