Can Texas Instrument's INA332 really be used for EEG?
You can decrease or eliminate the offset by changing the voltage on the REF pin, as detailed on page 11 of the datasheet. Since it has a pretty reasonable offset time stability of +-0.4uV/month, this should be fine for eeg (which is apparently 10-100uV externally measured). The temperature stability is a little higher at 5uV/C, but still manageable.