WTB: Genuine Battery 4-Cell T61/R61/R400/T400

[closersource]

Looking for a genuine 4 cell battery that fits the T61 14.1" W, R61 14.1" W, T400, R400 series. Prefer 4 cells because it sits flat in the back.
Needs to hold a charge and last at least an hour or so. Current pricing seems to be around $20 or so.

[underclocker]

In case you haven't seen this ad, it's more than $20, but it is new --> http://forum.thinkpads.com/viewtopic.php?f=11&t=99090