Spectre
Contributor
Genesis has HP100s too; but I've not heard good things about the newer ones [made by Asashi]. One of the instructors at Discover Diving is/was selling a set of Genesis HP-100s; not sure the age, not sure the price. I know he's had them at the shop for a while and hasn't had much luck [not too many in that shop interested in doubles], but the price might be right and you might be able to plug the crossbar to have valves to use as singles.
*shrug*
*shrug*