Wow, talk about instant karma! Actually, not sure this is instant karma because I didn't do anything deserving of getting any good karma in return. But whatever it is, I'll take it!
My 'there are none in the world' post above is timestamped 11:30am local time. At 11:56, my phone rang. It was the manager of a local electronics store who said he'd call me if and when they got one in stock. I never expected to hear from him but, true to his word, he called. I've already been to the store and picked it up and it's sitting next to me, shiny and new, at this very moment! Off to install it now ...
[ EDIT: Occurs to me that if today's to be my lucky day, I'm not working this instant karma angle hard enough. So... "You know what else you can never find? Winning lottery tickets, that's what. I've been trying for YEARS without luck". Wth, worth a shot. ]