drugstore.com - this could be a good starting point - for sure it will show you the bottle and maybe you can find it other places cheaper.
www.drugstore.com/green-sprouts-glass-preemie-bottle-2-oz-just-born-green/qxp343869?catid=182610&fromsrch=2+oz+premie+bottle
This is where I got mine.
genesis2forum.org/index.php?option=com_kunena&func=view&catid=2&id=9476&Itemid=66
genesis2forum.org/index.php?option=com_kunena&func=view&catid=2&id=8819&Itemid=66
I think if you go through the older Jim Humble video thread (I'll add the link here) - you may find some other resources.
Well, fiddle, I can't find that thread! Sorry. But the two threads above should help.