It's sold and gone but interesting. Maybe he'll make more? hp should have and could have made these.
http://www.ebay.com/itm/Power-HP-Classic-35-45-65-Calculators-w-Any-AA-Batteries-Via-This-Adapter-/110973962660?pt=Vintage_Electronics_R2&hash=item19d69049a4&nma=true&si=KDe%2FMpDs5Unkyb491gMF0VW%2FwHQ%3D&orig_cvip=true&rt=nc&_trksid=p2047675.l2557
Sorry for the cut and paste; i can't get the link function to work today.