One of the features of having a volunteer gig at ARRL in Newington, CT, is getting to drop in at this store. To my mind, it's what Radio Shack should have been - a great place to browse for doo-dads for the next building project.
What stopped me in the aisle was an item hanging on the rack - An "11-pin octal socket". A weird concept, that.
You can search for them, too. I also find a listing for 4-pin octals.
Note added: Latin lovers and computer geeks will realize that "octal" means eight. See Wikipedia on tube sockets. I find sockets named "Septar" (7 pin), "Noval" (9 pin), "Decal" (10), and "Duodecal" (12). There was a brief time when engineers still knew some Latin! Now, an 11-pin octal doesn't raise an eyebrow.