Sonnox are one of the genuine quality tried-and-true developers. They've had periodic 50% off sales for a long time, but these are by far the deepest discounts I've seen across their range:
The Sonnox Summer Sale starts on Wednesday, June 8th and runs until Wednesday, July 13th.A specially curated, brand new bundle, the Mix Bus Bundle, exclusively for this sale.
The Mix Bus Bundle contains our Inflator, Limiter and Dynamic EQ Plug-Ins, priced at an unprecedented £95, an 81% saving! That's cheaper than buying any of them individually at full price, or Limiter or Dynamic EQ at the sale price!
A massive 75% discount on the Inflator, Drum Gate, and Envolution Plug-Ins.
50% discount on almost all other products, including the recently released Claro, making it the cheapest Claro's ever been.
https://www2.sonnox.com/pub/plug-shop/shop-b.php