Well, I've got good news and bad news.
The good news: Exped's sewing kit is an excellent piece of gear.
The bad news: it will cost you about $75 to get one here in the US.
The US distributor for Exped is Outdoor Research. I called them last week and they said that they do not import the Exped sewing kits on a regular basis. They would be willing to special order one for me, but the cost with all the duties involved would be about $75. I also googled for the kit and every place that had a hit was out of them.
The ultimate irony: Backcountry Gear had the kits on sale a while back for about $7... doh!
If anyone else has a source for these kits at a more reasonable price, I'm all ears.