Yeah that is true, you can still order individual whole models but the days of ordering 5 metal heads are gone. The bitz packages so far are only space marine shoulder pads and GKT arms, but apparently more are being added. It seems like a pretty crappy situation so far, but I am willing to give it some time to see how it all pans out, the fact you can buy Balrog wings separately gives me some hope GW will make this work.
In your case, I think they used to sell sprues of just jet packs, not so sure anymore, but it seems like the thing that GW would make a bits package for, so just give it some time and it might just happen.
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