they wont cut glass you don't buy there in case they break it. The glass they sell has a very low safety factor. Most you can't even use for a window or a shelf. Save yourself the money in the long run and pay the glass shop to cut it for you.
order 1.5" thick 4x8's and build a 4x8x8.
cmon you know you want to.
lol yeah better just ahve them cut it, may seem expensive but it's much cheaper than breaking the first and havign to order another and have them cut it anyway.