Greetings @susan14,
I second Amethyst and Amaris- you can find just about everything on Amazon! 
Just be sure to check the seller and reviews though, as I’ve come across plenty of fakes. There are certainly good things there, but you do have to search for them 
Additionally, I recommend Fire Mountain Gems and Beads. I wrote a review on an order I got from them, and I’ve since ordered again! The chip stones comes in various sizes and grades and I’ve been very happy with the quality. Just be aware they are primarily a jewelrs site, so many of the crystals come with holes for beading 
I hope you’re able to find exactly what you are searching for!
Blessed be 