This is the group buy for the B-Box/ Hw6.4 kit it includes. PCB, SMD (no nrf), 1 x xt90 power cable, 1 aluminum heat sink and silicone heat transfer pad + screws. The enclosure for the box doesn’t quite fit the cover PCB but if you want it its an extra 5$ and includes said cover.
The kit will cost 105$+ any paypal fees and shipping. This price is almost at cost for everything. The heat sink has 4 holes making it ideal to mount. SMD only kits are 80$