When i got my Bionic, 3 days after it came out, i had the option of the Hard shell/holster case, which i bought a bit later, which does support the Extended Battery. i got it from the REAL Verizon store near where i live, not one of those "Authorized Resellers"
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The hard case from Verizon fits over the extended battery case. I have the extended battery and case.
I know that verizon itself doesn't sell one yet. I went in and asked them and they said they might get some in a month or two.