Heres a version of a Pied d'Elefant bag on sale in the UK
More weight (460g) but rated below freezing (-3C 26/27F?). Note that the fill is on the EU scale which makes this closer to a 900 (I believe).
It appears that the actual insulated section might be shorter than the Nunatak bag but it does envelop 360deg, it also has a zip at the base of the footbox.
Priced at £65 ($128) which includes postage within the UK.
No connection with Alpkit myself other than having bought some nice stuff from them before.