Munroe,
That ebay listing appears to be a great deal, but it's coming from Hong Kong. The last time I ordered something from there it took about 3 weeks to get it. You can get single batteries shipped from New York for $6.18 shipped.
http://cgi.ebay.com/NEW-BATTERY-HTC-...item35a8c5e0a9
Thanks OP for pointing out that this battery is compatible because I just saved a bunch of money.