We have 273 units of the Half-size breadboard in stock at our Sydney warehouse.
We can get a further 100 units from Adafruit Australia.
If you order today we can dispatch this stock between Wednesday, Mar 27 and Monday, Apr 01 2019.
Adafruit's Description of the Half-size breadboard
This is a cute half size breadboard, good for small projects. It's 2.2" x 3.4" (5.5 cm x 8.5 cm) with a standard double-strip in the middle and two power rails on both sides. You can pull the power rails off easily to make the breadboard as thin as 1.4" (3.5cm) and stick it onto an Arduino protoshield. You can also cut these in half with a saw to create 2 tiny breadboards, or "snap" these breadboards together either way to make longer and/or wider breadboards.