Most of my business is books, so usps media mail is my main shipping method. I recently started selling other products as well, is there a way for magento to only display usps media mail for orders that are books only?
You can restrict some shipping methods based on product conditions as described here: How can I hide a shipping option if that option is available as flat-rate or free?
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The screen goes from the discussed extension shipping restrictions. You can find it (or similar) at the magento connect. There is no build in restictions in magento I'm afraid. – Amasty Jul 30 '14 at 20:55