Saw this on ebay, figured it might be interesting to people here:

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https://www.ebay.com/itm/1-X-HUAWEI-BTS3900B-GSM/402353965814​

 

Huawei BTS3900B, 900/1800MHz variant. New in box, quite a few available with free international shipping.

 

Supposedly speaks Abis.

 

Old list messages regarding this thing:

 

http://lists.osmocom.org/pipermail/openbsc/2015-June/000324.html

http://lists.osmocom.org/pipermail/openbsc/2016-January/007818.html