Here are some options:
1) The video contest starts tomorrow and ends 10/31. You can use the demo version to enter, in the past all entrants got a coupon for around $ 25 after the contest ended. I expect it to be the same this year but it hasn't been announced yet.
2) Sometimes people sell their license on this forum, sometimes at a substantial discount. I got mine for less than $100, the only drawback to that is you can't sell that license later and you can't choose your instrument packs - you get whatever was originally chosen.
3) Typically the Pianoteq sales here don't discount the Stage version.
4) bhphotovideo.com usually discounts Stage, currently the price is $ 126.65 US before tax.
Kawai ES110, Pianoteq 7 Standard, Electric pianos, Steinway B and D, Bechstein, Bluethner, K2, U-Phoria UMC204HD, Sony MDR-7506