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I love RetailMeNot, because they always have current coupon codes and ratings. (People vote whether or not it worked for them and it's more reliable that way.) They post current Expedia coupons, however you won't get a blanket percentage off from the travel sites anywhere. Booking sites are always very specific, such as "last minute flights to Las Vegas", etc. If you aren't set on where you're going yet, it's a very good savings.

coupon codes

They have a good collection of coupon codes here:

http://www.bigcoupons.com.au/wild-earth.php

You can have a look if interested.

http://www.discountstorm.com/Travel/Expedia-com-Di...