Our longtime friends at SonicStudio offer the DynPEQ plugins for trial or sale. More importantly, holders of DynPEQ licenses for versions before 1.3 can purchase upgrades at SonicStudio. You can visit the DynPEQ portal at SonicStudio through this link.
DynPEQ sales and advice are available through Wind Over the Earth in Colorado. You can contact them via email or call (303) 443-9822.
There will be other outlets where you can get Trio or Quartet, and they will be posted here once they are established. Please re-visit this page for updates, or follow the Wholegrain product announcement Twitter feed: @WholegrainDS.