The Plantronics W720-M has now been officially discontinued by the manufacturer although it may be available as a refurb. The nearest equivalent replacement product is the Plantronics W8240
The Plantronics W745 has been officially discontinued by the manufacturer although it is possible that limited stock may still be available or it might be available as a refurb. The official replacement is the Plantronics W8245
The Plantronics W730 has now been officially discontinued by the manufacturer although it may be available as a refurb. The nearest equivalent replacement product is the Plantronics W8240