Following the $39.97 Sears tip for the Apple iBook Li-Ion Battery for previous-generation iBooks, a reader notes that Small Dog Electronics charges $39 plus $7 for UPS Ground. (To find it, search for "iBook Lithium".) If Small Dog sells out, MacSmith has iBook batteries for $49 each in the PowerBook section of its site. Whichever way you buy, it'll beat paying over $100 from most other sources. Update: a Danvers, MA, reader reports that a local Sears reduced iBook batteries to $19.97.