Fuck half link chains. Absolute worst design for a chain. Go for a Fly Tractor or Odyssey Bluebird. Both offer the EXACT same adjustment of a half link chain. Cheaper, lighter, stronger, and less stretch.
Yeah I know I'm going to eventually get a bluebird but I want to keep a couple half links with me for when me or my friends need them like the other day when his wheel was either rubbing on the frame or hanging off of the dropouts.
I have a brand new Bluebird rode once that ill sell you for $15 shipped. Includes receipt to prove its age and og box.
As for having a chain laying around for extra half links, just get the cheapest one you can find. Even the cheapest halflinks use thicker links than the single halflinks that come with the Bluebird and Diesel.
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