You can buy the books from McSweeney’s!
You can order the books from an indie bookstore like The Norwich Bookstore.
Here’s a link to Indiebound.
If you would like a signed or personalized (“For Dolores, who was always meant for adventure … Happy Holidays!”) copy of the book, the kind folks at The Norwich Bookstore would be glad to help you out. You can order and pay by phone or online here. (You can send the details of your personalized message to them at firstname.lastname@example.org) Your book will be signed and shipped right to you!