I got a quote for a 54" vanity top from a fabricator who happened to have a perfect sized remnant of 2 cm Arabescato, which is a lot like Cararra. It was around $850, I think. I would supply the sink.

Another fabricator offered to do the fabrication for $235 if I do my own template and install. I found a remnant of Chroma Quartz in the finish that looks like marble; it's called Lattice. I got it for $250 so I'll be around $500 all in, plus the cost of the sink.

Our local Chinese import cabinet/granite shop sells prefab marble tops in 60" length for $199. They'll make cuts for $30 each, so I considered going that route and just cutting off the ends. But I didn't need my ends finished because the vanity is in an alcove; you might not be able to do that.

>Is it likely to be higher or lower through a stone supplier and fabricator than through a big box retailer?

The big box store just contracts it out and takes a cut, so it's almost always more.

Also, for that size you might be able to find a remnant at a stoneyard that would work and those are usually much cheaper than buying a full slab.

If you can make the prefab work that's usually the cheapest route.

Thank you both! Sounds like a trip to a stoneyard is in order to go searching for remnants.

We had installed a 72 inch vanity top with 2 under mount sinks and an eased edge from a remnant for $972 including everything. Shop around as much as you can, my original quotes ranged from $1100 to $1365 before I found the remnant. Good Luck! I love it!