craftgrrl | Swarovski mosaic square flatbacks

Hiya darlings.. So I have turbo sadface going on over here.
As you can see the bottom swarovski crystal on the right side on my glasses fell off (I don't have it) so I have two questions for you bbdolls.
First, do you have any idea where I could find square swarovski flatbacks??
My best bet was Michael's Craft store but they didn't have any.
And all local/online stores you can think of would be fantastic!

Also, what type of glue would you suggest using to glue 'er back on?? Think E6000 would do the trick?
Any and all suggestions are greatly appreciated!!
Thank you and have a craftacular day!!
XO