I see a used single for $80. (which means GC paid about $35 for it to the seller)
(Using GC math, 60% of Half the new cost, in general, so that's $120 new, 50% $60 and 60% of $60 is $36 per speaker.)
Or you could get a new single from GC, trade or haggle them down.
Another single new is $120, you might get 15% off, maybe $100 plus tax....seems a waste if you predict they will have problems too and be clicking off due to heat issues on the other.
Or you could sell your working one for $36+ to GC and get a new set of something different and upgrade...to the JBL's mentioned or something.
Or you could be a bastard and try to get GC to fix it for free, or send it in to GC see what the repair costs and you decide if you want it back or not , based on repair bill. If its too high, just let them keep it.
I see a used PAIR on Ebay for $70 - Buy It Now...plus Shipping. Pretty cheap monitor.
How much did you use them and invest in? You aren't out too much. Not like a pair of $3000 monitors burning out.
I wouldn't put any new cash into them, its a $35 speaker. How much do spend fixing a $35 speaker?