Unfortunately, I don't think there are any US based vendors (at least that I'm aware of). In the 55+ page thread on Cerebrolysin,
http://nootropic.eu/ seems to be most recommended source for cerebrolysin. I'm in the US, and ordered my first 5x5 ml pack from them, and they shipped promptly, now just waiting to try it out

Another option that is available in the US is the oral pill form of Cerebrolysin. It's called Cebria, and contains the NPEP-12 protein that is manufactured by Ebewe pharmacy in Austria. The site has a 30-day risk-free trial for the supplement. Details at:
http://www.cebria.com/