Yea - great question!
I live in Canada and was ordering them from a distributor in Alaska. For me, I was looking at a good 7-8 weeks, depending on when the distributor would put a new order in. Keep in mind though that 2 of those weeks was getting the bullets from the US into Canada.
Things have changed though. As I understand right now, GSC does not have any distributors in the US or in Canada. Because of that, I was informed that I could order directly and I would guess that in that case, the wait could be much less.
If you're not in a hurry, willing to spend a bit more on bullets, and are into experimenting, definitely give them a try. Because of their drive-band design, they do not increase chamber pressure when seated into the lands - but that may or may not be an issue anyway. So far, my .257WBY likes them best 0.080 off the lands. The science behind reloading them is a bit diferent than with lead jacketed bullets.
I'm having great accuracy with the 100gr HV's @ 3940fps. They also make a .257 92gr SP bullet that has an amazing BC of .567, however, because it's a solid SP, it would probably not be much good for anything but target and paper puching because it will not expand. Also, you would probably need a faster twist for some of these. Because copper is lighter than lead, the monometal copper bullets are a bit longer than lead bullets of equal weight and sometimes therefore require a different twist than you would expect.
The .257 Lazzeroni sounds mighty amazing.