(1) It's in Vintage Cheever, a book that Random House has made available online in full text.(2) Here's a Google books version of the story, "Goodbye, My Brother": link.
(3) Here's the Amazon entry for Cheever's Collected Stories: link.
(4) And here's the Kindle edition: link.
(5) And finally the story is on the web (although password-protected): link.