Available as an assembled Module and as a DIY project.
This Module is currently available.
Based on the classic ARP 4014 sub-module
This is a vintage ring modulator design with bags of character. It is based on the classic ARP4014 sub-module which was used on the ARP2500 modular and ARP2600 semi-modular synthesisers.
The design has a fully discrete core but uses two op-amps for input and output amplification.
Each input can be switched to either direct coupled (DC) or high pass filtered (AC).
http://www.krisp1.com/store/index.php?main_page=product_info&cPath=5&products_id=38
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These merchants probably sell this module. Huh?