Can you buy Silestone or Caesarstone by itself?

Question:Home Depot and Lowes sell these materials and include fabrication and installation into the prices driving them skyhigh.

Where can I buy a fabricated piece(s) for my countertops without paying for installation from them? Also what are the ballpark prices for the material+fabrication alone? I'm in Austin Texas.

Answers:
no. tried this but they would not let me! the installers were horrable so now i talk my custommers out of it!