I ran across the same thing the other day, I did a search on "singles" and only came up with 3 items. Then later that same day, I searched again, and there were 27 items ending in that day.
I just went to CBID, and sure enough there is not a single single cigar listed anywhere any category on that site. Clicking singles, or sorting by that criteria yields zero hits (or items)
I just bought some singles from them this week........... package should be at the house when I get home !
I am hoping it's just website craziness that caused the singles to disappear. I love being able to buy a single along with some other regular stuff.