I haven't heard about the shot shortage. I do know, however, that taking sublingual B12 is just as good if not better than the shots. I take the Jarrow Formula from iherb (5000 mcg/5 mg) that is sublingual methylcobalamin. It's far cheaper than getting it in stores.

You shouldn't have to get a shot. When I had the shots back in 1999, my B12 did not go up very high and I still had paresthesias. It was only when I started taking the sublingual kind that my numbers went up and I got better.