You can also get a distributed BMS for the GBS cells directly from Elite Power Solutions
. (One cell board per cell.) They sell it at a loss, just to owners of GBS cells, just to sell their cells, so you can get it at a good price (digital, $ 870). Though I am not sure if they'll sell it to you after you buy their cells from a reseller.
If that doesn't work out, the only distributed BMS that works with those cells is the Lithiumate Lite
. (digital, $ 810)
Otherwise, any non-distributed BMS will work, such as Orion (digital, $ 1010) or MiniBMS (analog, $ 726).
Prices are for 56 cells, and come from the Li-ion BMS selector