It's also available at AudioDeluxe. No freebie or sale code currently, but that might change (the sale ends pretty soon though). And there's always DeluxeBucks.
https://www.audiodeluxe.com/products/virtual-instruments/uvi-beatbox-anthology-2
As always, there's a free trial at United Plugins.
https://www.unitedplugins.com/Plamen/
Also available at AudioDeluxe with the freebie.
https://www.audiodeluxe.com/products/audio-plugins/united-plugins-plamen