Chris, KA8WFC, sent me a lead for Octopart, a search engine for electronics parts that searches the stock of Mouser, Digikey, Newark, and Allied. Rich, KD6HWF, also pointed out that FindChips.Com does the same thing, but with more vendors.
I tried both searching for the elusive 1N34A. Both websites show that Mouser has them available for $0.51 each, and that Newark has them for $1.15 each. FindChips did come up with a bunch of other suppliers, but it looks as though you’d need to contact them for a quote, and that you probably couldn’t buy just one or two from them.