Originally Posted by Marvin the Martian
There was a package deal for the E11 on Amazon before that bundles a spare battery in with it for no extra charge.....don't know if it is still there though.
Usually, the Amazon vendor that features the accessory pack for the E11 + spare battery & charger is Micca Store: http://www.miccastore.com
I've used them before and didn't have any issues with my order. Plus, they're allowing users who purchased the E11 before July from them to order the accessory pack and they'll refund your $5.00 after your purchase. The accessory pack (spare battery + charger) runs about $10.00.
Edit: I also wanted to mention that the Micca Store is local (within 10 miles of where I work) - but, sadly, they only do mail orders due to not having a store front. I'd love to be able to head into a shop and buy some FiiO gear without having to wait 2 - 3 days on shipping.