I had the same experience with SynthCube/Small Bear a number of times.
If you're on SynthCube and search through its Small Bear portal that you know is in stock on Small Bear, the search engine may not find it. Can't remember what it was, but the reverse also happened. Searching Small Bear for a tube of LM13600 ICs, nada, but it came up on SynthCube, luckily I was able to order the tube before they were all gone.
It wasn't that I mistyped, I tried a variety of times with different keywords — get the search string right and stuff would come up.
(Can't find the tube-of-LM13600 listing now at all.)
PS: What's "AES" again?