Find some in the US and I'll work with you to get it.
Thank you for the offer, but I'll be in the US (to be precise on a 2 week roadtrip through california) in a few weeks anyways, so the name of a store that shoud carry it would already help me out enough.
You won't find that on a shelf anywhere.
If you're "certain" when you might be someplace order and see if they'll ship it to your hotel and have them hold it.
Getting through x-ray at the airport, who knows.
Back in the day, it is amazing what I could carry through security in my carry-ons when I was flying somewhere to work on a server. I aways flew with a knife and had only one issue in 2000 because it was an International flighty and they had the Pilot hold it for me and give it to me when I got off the plane.
It didn't bother them that it was a knife, they said it was "aggressive" because it had a 2" Spyderco blade with serrations. The serrations really bothered British Air.
At the price differential, you may want to get both of these solders with and without Silver.
I usually use silver when I want something to set up very strong, like up to 4% Ag. But it gets much harder to desolder if you have to rework it later.