Francis Rose has taken over APBA, since the original company folded. He posts stuff for sale on EBay, and you can probably find him there. He has a mailing list, if you want regular updates on what's available. He's putting out new games, not just recycling the old stuff.
I loved APBA, but have "graduated" to a Strat-O-Matic league just because I haven't found any APBA players in my neighborhood.
The thing I always liked the best about it was what the key numbers were always the same, so that a big dice roll had immediate impact; whereas, in Strat, you constantly have to check the charts to determine the outcomes. APBA plays about twice as fast, too.