My go-to for 4-wire has always been Agile (agile.co.nz). Try them, they might have some RAD gear in stock.

On 7 July 2015 at 13:01, Dmitry Konchanin <dmitry.konchanin@dtsanz.com> wrote:
Hi all

We are suddenly in need of a couple 4-wire SHDSL EFM routers. There is basically no retail market for shdsl devices, ones we found are only 2-wires or have to be ordered with a lead time of couple of weeks (except pricy Cisco 888E option).

If somebody has an access to stocked supply of such devices, could you please contact me off the list.

--
Kind regards,
Dmitry Konchanin

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