Please forgive this intrusion, I thought someone in your field (engineering, math, or science) might be interested in this.
There is an effort underway to get Hewlett Packard to start making the15C, or a similar model again. A web site with a petition has been setup. If you are like the others who have already given their support, and would love to have a well made calculator like the 15C available again, please take a moment to go to the web site and sign the petition. If you are not familiar with the HP 15C, the web site will tell you more about it and why it is the best scientific calculator for everyday use. At least one member of the calculator planning department at HP is sympathetic to the cause, and will argue the case to those who make the decisions, however, many more signatures are needed, so please tell anyone you know who would also benefit from a quality calculator like the 15C, to check out the web site.