Yeah $14k seems crazy, look at some of the sizes/prices in the link I posted, $4692US ($6k NZ) for 120x48x30", but I imagine shipping would cost a bomb. Glass would almost certainly be cheaper, I'll have to ask Greg next time I see him, but the problem with glass is that it would need to be made on site or moved with a hiab or forklift.
Biggest downside with acrylic is that it scratches easier than glass, but on the up side you can repair the scratches, unlike glass.