make a travertine table

    I want a travertine coffee table. I saw one at www.kingsroadhome.com. The travertine slab is very thick--looks to be about four inches. It takes sixteen weeks to be delivered. It is also a little wider than I want. So I wanted to know how easy is it for me to buy a slab of travertine to make into a table? (55"L, 30"W) I thought this may be the way to go because then I can also choose the coloring of the travertine. I do want it thick--like the one at King's Road Home--will this be difficult to find? And how much does a slab like this cost? Thanks!!