Kyocera-Mita have joined the multiple color tariff gang by putting four counters (including one monochrome) in their new A3 color range.
The first color level is intended to be priced as monochrome, and the precise color coverage for each level can be adjusted by a technician (e.g. first level up to 2% color coverage; second level up to 10%; third level from 10% up). 

Please note that this tariffing strategy can vary from country to country, from distributor to distributor, and can be negotiated by each customer ...