Seriously, don't spend money on another cab with greenbacks! They are just about the worst possible choice to solve your problem, even though adding more speakers is a normal response to not being loud enough. Regarding the alnico Blues, a second cab would share and handle the power, but you would still be sending half the amps power to the inefficient speakers, so you would probably not sound as loud as just the Blues. But a pair of Blues, while standard equipment for an AC30, will blow even without fuzz. They last a while but if an aC30 is cranked regularly they will eventually blow. Fuzz will blow speakers rated for more than an amps output because of the shape of the wave it sends the speaker. So your combination of running the 30w amp at full volume regularly with a fuzz makes a pair of 15w speakers a poor choice. Can you order speakers from online sellers like Musicians Friend etc? There are plenty of choices for new efficient speakers with the cutting mids an AC30 wants.