Update README.md

Author: dreamos82

README.md

@@ -12,7 +12,10 @@ Currently these notes are a work in progress, but many chapters are functionally
 
 We hope you enjoy, and find something interesting here!
 
-Physical copies can be order via Lulu: [Click here](https://www.lulu.com/shop/dean-tuckey-and-ivan-gualandri/osdev-notes/paperback/product-mpzp5v.html?q=osdev+notes&page=1&pageSize=4)
+Physical copies can be purchased via Lulu: 
+* Paperback: [Click here](https://www.lulu.com/shop/dean-tuckey-and-ivan-gualandri/osdev-notes/paperback/product-mpzp5v.html?q=osdev+notes&page=1&pageSize=4)
+* Hardcover: [Click Here](https://www.lulu.com/shop/dean-tuckey-and-ivan-gualandri/osdev-notes/hardcover/product-je5drpr.html?page=1&pageSize=4)
+
 
 The [latest-master](https://github.com/dreamos82/Osdev-Notes/releases/tag/latest-master) release contains the PDF built from master.