Bumping an old-ish thread as I have more info on the matter.
You can buy the ABQ direct from EMG now. $89.00, you're better off buying the whole set since the ABQ is that much. Also, EMG has a reverb store that sells open box items. You can get the whole EMG P/U with ABQ and all wires for $105.00.
Yesterday I received a JE-1000 clone from a guy on e-bay for $45.00. Installed it last night with my Alexi EMG pickup. This thing is awesome! Probably about the same amount of boost from both, but the Jackson JE-1000 clone has a much more pronounced wah sound to it. Much better JE-1000 clone than the one I bought many years ago from someone else. This one is dead silent...unless you have the boost pretty high, then you will hear some noise.
Wanted to share this info as I have now tried the ABQ and JE-1000 with my EMG ALX pickup. They both sound great, but for $45.00 the JE-1000 clone is a much better option. Probably going to order a 2nd one just to have as a spare or to put into another guitar one day....got a Jackson Brandon Ellis Signature Kelly on order....so it might get a pickup change and JE-1000 added to it too.
Sill on the hunt for a J-50BC, so if anyone has a lead on one or has one they want to sell, just let me know.