All ladies undies (thongs, bikinis, boy shorts etc..) are on offer at 10 pairs for £25, use code CHRISTMAS for an extra 40% off and sign up to the newsletter for another 15% off on top of that. Delivery is free at the moment also.
Cant comment on the quality yet but at just over a £1 a pair who can complain, also most of the undies retail between £6 and £12 (ridiculously steep!) so this isn't a bad wee saving.
The 40% CHRISTMAS code & 15% sign up code apply to rest of site too.... Its a US brand and new to the UK but looks similar to Abercrombie Fitch and the like.
Edit: the 40% & 15% codes worked for me on the 10 for £25 aerie undies Sunday night, the websites obviously noticed their mistake but hopefully a few of you beat them to it! Sorry HDUK :(