Hooray! A fellow role-player as well! Most of my friends play D&D, Modern, and Star Wars. I DM'd for SW before, but I haven't gotten around to write new material for a while. Lately, I haven't been roleplaying too much, due my short attention span when most of us play late at night before I go to work the next morning.
As for LARP, no we don't, we do mostly Table Top RP, we've focused on Star Wars d20 lately.
As for finding other Nerf guns, my favorite place to shop for discontinued guns is eBay. Sporksboyofjustice also made an excellent writeup about acquiring Nerf guns a while back.