Need help finding 11mm glass windows (lens)

[Moddoo]

As stated,
I am having trouble finding tiny (approx 11mm) flat lenses for some parts I am working on.

Anyone know where to find something like this?

Thanks

 

[Lyndon]

Anchor Optical has 12.5mm plastic lenses for $4.50 for bag of 10 each: http://www.anchoroptics.com/catalog/product.cfm?id=152