Pricing seems about normal for products in this space, even a little low. I'd think that the big question that anyone considering buying this should be asking is around Google's history with hardware support and service. This kind of product will often be expected to be used for 5+ years and the dependency of a non-core service from Google could affect that.
As I'm looking to purchase one of the products in this space, here is a little more comparison info in case anyone else finds it useful. Only Google will sell you one of their devices, everyone else goes through resellers with opaque pricing and unpublished RRPs.
Microsoft Surface Hub 55": 1920x1080 @120Hz, 4th Generation i5, Intel HD 4600, 2x HD cameras. Windows 10 + MS Office
Microsoft Surface Hub 85" 3840x2160 @120Hz, 4th generation i7, NVIDIA Quadro K2200, 2x HD cameras. Windows 10 + MS Office
Cisco Spark Board 55": 4k (4096x2160?) display, unknown hardware and software, 4k camera. Cisco Spark and SIP protocols supported, requires Cisco Collaboration Cloud service.
Cisco Spark Board 70": same as 55"
SMART Board 8055i 55"/8065i 65"/8084i 84": 3840x2160, 4k available. Doesn't seem to have cameras for videoconferencing, comes with SMART Meeting Pro 4.0 software to "collaborate in the 4th dimension", whatever that means.
Google Jamboard 55: 55" 4k (4096x2160?) @60Hz. Unknown hardware, software probably Android? Costs $5000. Requires Google's G-Suite subscription, uses Hangouts and $600/year annual management and support fee. EOL is May 2021
[1] https://www.microsoft.com/microsoft-surface-hub [2] http://www.cisco.com/c/en/us/products/collaboration-endpoint... [3] https://home.smarttech.com/interactive-displays-for-business