Over at LaSenza.com, you can currently enjoy a Buy 1 Get 1 Free promotion on select bras. There's no code required for online purchases, you just need to put two of the eligible bras in your shopping cart and the discount will be applied automatically. As always, the free item must be of equal or lesser value. Note also, that shipping is free on orders over $89.
There's a large selection of styles to choose from with pricing starting at $18.50.