aftermarket laptop battery

Hi
My battery is dying for my Dell laptop. I'm extremely broke at the moment, and found a battery for my computer online, through a canadian website for $200 less than dell is asking.
I just don't know if it's a reliable enough concept, although the site looks good. Anyone else had an after market battery?

I bought one off ebay, and it was just fine.

before you buy a aftermarket battery, check for reviews or complients by searching the net. there have been issues with cheap ones(make in china, now there is shock) that are overheating.