I forked about almost 130$ recently for my license. I honestly have more fun and put more hours in to using construct 2 than any games I have played in recent history. I feel good about the purchase and the price and hope it helps to support the development.
There is a game contest on the forums right now, maybe enter that for some extra cash towards your license purchase?
It would be a shame for construct 2 to have a discount when the software is worth much much more than it sells for.