Hi Rick,
I'm doubting it too, but if the example Artzi lists is in fact amber - I note the term amber like is very deliberately used - then this looks identical. I totally defer to others on this and I suspect you are right. Could be the floating piece is a fluke due to the small size of the sample.
Is the amber in the links you included the "only kind" of amber? This stuff certainly looks nothing like it.
BTW, I didn't mention what I paid but it was in fact pretty cheap! Having said, I just got a
PAIR of ivory handled kukris for $80! It can happen...