It's been traded. It's old. Therefore your public library. Therefore an online catalogue, which means that every library in your state will be clambering to do you service... Your trade of the Annihilation wave may have travelled 500 miles in a white panel van to come get clutched by your greedy little fingers. You'll only have to waste your time, not your dollars.
Of course if you like it, then you should buy it.
The space stuff at the time was highly interconnected because of a big frakking war, and some of the complimentary books written by other bozos are neither necessary nor good, but you mileage may vary.