http://ams-research.com/english/index.html (never ordered, not sure if they're legit)

http://www.pfbresearch.com/_pfb/index.htm (legit, but not currently selling, says check back in a few weeks or something)

Bravo trading no longer ships to the US.

Look up full research chemical names followed by "check out" or "shipping", words that implicate selling, on google. It might take some time, but you'll find some good ones. Also, make sure to make it so google also finds pages not in english, then just use the google webpage translator to view it. Some have English options too just not on default.