We are selling FOUR Yeastar TA-1600 Gateways.
They have been out of the box as we thought we had purchased TA2400's.  These were, never deployed.
As such, you get a Deal.
And, they are on Global Backorder.

Yeastar TA1600 offers 16 FXS ports to connect TDM based telephony infrastructure to an IP network. TA 1600 facilitates communication for small and medium sized businesses with a cost-effective and reliable solution.
Fully compliant with SIP and IAX2
Flexible calling rules
Reliable fax performance with T.38
Provides high-quality voice compression with industry standard codecs
Line echo cancellation for 32, 64 or 128 ms echo delays
Web-based GUI for easy configuration and management
Excellent interoperability with a wide range of legacy and IP equipment