Is there a Bundle for the Deskmate and my Cisco Phone?

Yes, there sure is!!

DeskMate Single-Ear Cisco IP / Plantronics Bundle cat #2125 on website

and

DeskMate Dual-Ear Cisco IP / Plantronics Bundle cat #2124 (Discontinued)

This includes the headset and the cord to connect to Cisco phones.

Make sure to check compat to ensure the Sennheiser Quick Disconnect Cord for Cisco Phones is the right cord for their Cisco phone model.