Just got some confirmation back from the guy I got them from.
So you were right off the bat xD
No, I haven't browsed them before, but I will definitely check them out now
I appreciate the help Kathy.
Also, I got in touch with some landscape suppliers around me, and they had some boulders of "Feather rock" "Black Ice stone" and some other misc rocks. I know feather stone would work, but not sure about black ice stone... Still no supplier for river rocks though.