Aren't they the cuuuutest little things? Actual size is 0.35" by 0.625", and in real life the top and bottom soldermask are the same shade of OSH-Park Purple; for some reason the camera didn't capture that.
Ordered the boards, let's see, Sunday, September 28th. There was unused space on an expedited panel, and my tiny boards fit, so I got a free upgrade, and the purple envelope turned up in my mailbox today, Wednesday, October 8th. All for $3.15, delivered, for nine pieces. Digi-Key box with parts also arrived today, and I took a few minutes to assemble four of the li'l goodies.
Yeah, it's a stupid simple circuit, and, yeah, the same functionality is available in a single tiny chip... which needs to be mounted to a board, maybe with a capacitor, in order to be useful. Ever try to solder one of those 4-ball micro packages? It ain't easy! This has all practical-sized parts, so I can build it by hand.