"You order any LingvoSoft or ECTACO software item and a 25% discount is automatically added to your shopping cart! Want to order another one — no problem! LingvoSoft will give you another 25% off!"
The quote says it all. There are only 500 discounts available, and at the time I posted this, there were only 293 left, so hurry if you want to take advantage of the offer.