AbeBooks is an excellent source for 2nd hand books: <https://abebooks.com>
I found Nim in Action for $27, free shipping within the USA: [https://www.abebooks.com/servlet/BookDetailsPL?bi=31457277182&searchurl=ds%3D20%26kn%3Dnim%2Bin%2Baction%26sortby%3D17&cm_sp=snippet-_-srp1-_-title5](https://www.abebooks.com/servlet/BookDetailsPL?bi=31457277182&searchurl=ds%3D20%26kn%3Dnim%2Bin%2Baction%26sortby%3D17&cm_sp=snippet-_-srp1-_-title5)
