Hi,
I tried to google for any online store selling replacement battery for Acer. Laptopbatterystore.co.uk seemed ok, although reading the reviews from this site made me a bit nervous to order anything from store, which in reality was located in China. I bit the bullet and tested ordering, using Paypal as payment option.
I received notification within minutes from Paypal about order, and just a few moments later I got another one from laptopbatterystore stating they also got the order. I was prepared to wait for quite some time, or possibly even not receiving the goods ever.
However, after roughly two weeks waiting, I'm happily holding the battery. It was properly packaged and wrapped in bulk box including anti static plastic wrapping, and came along with instructions, original postal receipt (half Chinese, half English):)
So, nothing to complain really, and after negative comments here I was even very positively surprised everything went just OK!
--quick update--
Delivery address was to Madrid/Spain.