As part of their US product launch Gigaset Communications are importing their DE380IPR SIP desk phone. At first glance this seems like a relatively unremarkable lower-end desk phone. However, it does support the G.722 wideband codec.
Amazon has the DE380IPR listed at $139. That might just make it one of the most affordable genuinely wideband-capable IP desk phones.
I say “genuinely wideband capable” because the older Grandstream Budgetone BT-200 supported the G.722 codec, but the handset components were not up to the task. The real benefits of wideband calling were only realized when using the BT-200 with a good wired headset. I’d hope that the newer GXP-1200 has overcome this issue.