If you have a place that sells Russian River belgians (Damnation, Consecration, Supplication, etc.), they come in those type of bottles.
Upping your collection can get rather spendy though, they're $4-$12 per.
They really should clarify that.
My cousin had his rubber stopper on his fermenting bucket fall in as he was putting the airlock on and had to reach in and grab it (after rinsing his arm and sanitizing as best he could). Beer came out fine.
My first batch i washed my hands and used them...
This once happened to my dad, years and years ago. The carboy was sitting on the counter in the house, wrapped in a towel. Needless to say, the texture on the ceiling in that spot isn't all drywall :p