Do es anyone know if they sell glass prisms ?

Yes when i was there they had several sizes available

Yes they do.

Yes, I believe I saw some at the back of the store, to the left of the lab glass.

While their selection varies due to the nature of their stock acquisition, there are usually a wide variety of lenses, prisms and other optical components to be had.

They have several varieties of glass prisms for sale.

They do sell prisms