It occurs to me that some of you might care to know where I get replacement batteries:
Wholesale for everyone (batteries department)
I've bought the small watch batteries for as low as .10 apiece (compare to $3! in drug/electronics stores)
and the CR2032 3V lithium cells (the one about the size of a quarter) at .51 apiece (of course, that was 50 of them).
They ship promptly and I've had no problems with their products.