H-Series price increase Plantronics H-Series Headsets Over the past couple of years, Plantronics has continued to experience increases in its costs of production and shipping. In response to these increased costs, Plantronics is raising the prices of all H-series Professional Corded Headsets, which will go into effect October 1, 2008. The U.S. MSRPs will also increase. The price increases apply to all H-series versions of SupraPlus®, Mirage®, TriStar®, Encore®, DuoSet®, DuoPro®, and StarSet®. Leave a Reply Cancel replyYour email address will not be published. Required fields are marked *Comment * Name * Email * Website