I've been buying wire-to-wire and wire-to-board Molex connectors that look like this:
from a local hardware store for years (the image is taken from SparkFun, which sells them with the crimp terminals and wire pre-installed).
I'd now like to buy a large number of them from an online supplier (e.g., DigiKey or Molex themselves) but I can't figure out what specific type of Molex connector they are. Molex's site has quite a variety of connectors and I'm finding it difficult to determine which product line these ones belong to.
Their pitch is approximately 2.5 mm (possibly 2.54) and they use crimp terminals that are held in place by a raised metal "flap" (one per terminal) that catches on a narrow rectangular hole in the plastic casing (in the photo above, these holes are on the underside of the female end of the connector).