Reliable place for a laptop battery?

[miston]

My priest needs a new laptop battery for his IBM Thinkpad T-21.

Where is a reliable, cheap place to pick one up?

thanks!

 

[AmigaMan]

I've picked up a couple batteries for my Dell laptops from ebay. Usually they're refurbs or system pulls but I've been lucky so far. The price usually can't be beat.