From now until the 9th of October 2010, online at Addition Elle Canada, they're holding a special promotion where you can buy one and get 50% off the second item of plus-size clothing!
When you add 2 items to your cart, you can see the discount applied - they take half the cost of the cheaper item.
The terms and conditions for your perusal:
Offer valid online and in-store from 19th September to 9th October, 2010. Online Buy 1 get 2nd at 50% off promotion is valid on select Addition Elle merchandise only, while quantities last. 2nd item must be of equal or lesser value. Styles with "2 for", "3 for", "5 for" or other promotional offers are not eligible. Not applicable on gift cards or previously purchased merchandise. Promotional offers may vary in selected stores.
Now, the email said that this was Addition Elle Canada only. I tried it on the Penningtons and MXM products, but it doesn't seem to apply to those. Shame!
(Ends 9th October 2010)