If you want to order a set of your own, you can get them from www.biscoind.com
Aparently, they don't always have them in stock, so you may have to wait a bit, but I got mine immediately. Their pricing structure is a little weird, and the punchline is that it's about the same cost to order five sets as it is to order one set. So order five, then sell them to your fellow builders.
Here's the part numbers you want to get:
Here's a link to a PDF with info on this particular latch and others from the series: