Update README.md

Author: getify

README.md

@@ -1,12 +1,14 @@
 # You Don't Know JS Yet (book series) - 2nd Edition
 
-This is a series of books diving deep into the core mechanisms of the JavaScript language.
+This is a series of books diving deep into the core mechanisms of the JavaScript language. This is the **second edition** of the book series:
 
 <a href="https://leanpub.com/ydkjsy-get-started"><img src="get-started/images/cover.png" width="75"></a>&nbsp;&nbsp;
 <a href="https://leanpub.com/ydkjsy-scope-closures"><img src="scope-closures/images/cover.png" width="75"></a>&nbsp;&nbsp;...
 
 **To read more about the motivations and perspective behind this book series, check out the [Preface](preface.md).**
 
+If you're looking for the previous **first edition** books, [they can be found here](https://github.com/getify/You-Dont-Know-JS/blob/1st-ed/README.md).
+
 ## Premier Sponsor
 
 This edition of the **YDKJS** book series is exclusively sponsored by [Frontend Masters](https://frontendmasters.com).
@@ -23,15 +25,17 @@ I want to extend a warm and deep thanks to Marc Grabanski and the entire Fronten
 
 ## Titles
 
-I recommend reading the books in this order:
+I recommend reading the **second edition** books in this order:
 
-* [Get Started](get-started/README.md)
-* [Scope & Closures](scope-closures/README.md)
+* [Get Started](get-started/README.md) | [Buy on Leanpub](https://leanpub.com/ydkjsy-get-started) | [Buy on Amazon](https://www.amazon.com/dp/B084BNMN7T)
+* [Scope & Closures](scope-closures/README.md) | [Buy on Leanpub](https://leanpub.com/ydkjsy-scope-closures) | [Buy on Amazon](https://www.amazon.com/dp/B08634PZ3N)
 * Objects & Classes (not yet started)
 * Types & Grammar (not yet started)
 * Sync & Async (not yet started)
 * ES.Next & Beyond (not yet started)
 
+If you're looking for the previous **first edition** books, [they can be found here](https://github.com/getify/You-Dont-Know-JS/blob/1st-ed/README.md).
+
 ## Publishing
 
 As always, you'll be able to read these books online here entirely for free.