2000 Nissan Maxima TORN CV BOOTS

Hii,

i was told by firestone mechanic that my cv boots are torn and are splitting the grease out.I generally drive for about 75 miles twice a week. Would it be a problem if I drive with torn boots? He said it would cost 500$ to fix them. Im a student and I cant afford that much. Pls tell me how long I can drive with torn boots with out any problem?