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Hi. Totally not Gordon Korman, but I did some searching and found NO COINS, PLEASE at some pretty good prices. I personally bought a used copy for $2 off of PangoBooks, a mobile app where people can sell and buy used books. Unfortunately there are not any copies on there as of right now. Either way, these are the used copies I’ve found for under $20.

This one is $14.05.

https://www.ebay.com/itm/374068044190?hash=item571831619e%3Ag%3Ap7UAAOSwv4tiekXs&mkevt=1&mkcid=1&mkrid=711-53200-19255-0&campid=5338304675&customid=&toolid=10049

This one is $17.99.

https://www.ebay.com/itm/374217291074?hash=item572116b542%3Ag%3ApHEAAOSwUa1i%7EPF6&mkevt=1&mkcid=1&mkrid=711-53200-19255-0&campid=5338304675&customid=&toolid=10049

And lastly, this one is $19.99. The seller has multiple in different conditions!

https://www.ebay.com/itm/255306949100?hash=item3b717ae1ec%3Ag%3A7J4AAOSwFkNiUw1B&mkevt=1&mkcid=1&mkrid=711-53200-19255-0&campid=5338304675&customid=&toolid=10049

I hope this could help!

Be blessed, 
Jade