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Usually these kind of deals are using a per-item shipping charge - they assume they will collect $6.48 for each battery. I checked this one, and sure enough . . . "Rates are based on shipping a single item. Purchasing multiple items results in multiple shipping charges--there are no "per shipment" and "per item" charges, as there are when you buy directly from Amazon.com." No matter - the shipped cost of a battery doesn't seem too bad at all, certainly compared to what my RAZR batteries used to cost.If you investigate that amazon link, they can be had for as little as $1.49.. If the $4.99 shipping is for multiple batteries, you could buy 3 or 4 for a pretty good deal.

I bought two spare batteries last summer. My door gets slipped off at least twice daily to replace batteries, (even though I am now down to 2 batteries again since I washed one of them), and my door is still just as tight as the day I bought the phone.
I, too, bought them off of Amazon, but was fooled into buying used batteries instead of new batteries (even though I did not pay a lot at all, the advertisement did say new).
It depends upon which works for you. For me, having a battery that does not work in docks and in my case makes it a deal breaker for me.
But I take the case off every time I have to dock it, so....
I'll stick to the battery swapping.