My app was rejected citing 11.3 (In-app purchase) I created an app that lets users store items in the app. There is an amazon button next to each item. When the user clicks the amazon button, the app finds the item on amazon and, if found, opens the amazon page for the item WITH-IN the app. 

Apple rejected the app citing 11.3 in-app purchase reasons. 

would it help if the amazon page for the item opened in safari and not with-in the app?
Read through the other points of the App Store Review Guidelines under Section 11. Purchasing and currencies. One more that stands out for your situation is this:


  11.13 Apps that link to external mechanisms for purchases or subscriptions to be used in the App, such as a "buy" button that goes to a web site to purchase a digital book, will be rejected


So while you could provide a link that will open in Safari (instead of opening the page in-app), if that purchase will be used in your app in some way, it's likely to get rejected by citing this clause.

Also keep in mind that any interpretation here or elsewhere of single line policy statements to provide a clear "yes" or "no" to questions may not be final. It's Apple's interpretation that actually matters.