Solid surface can be purchased in sheets from many places. Distributors sell solid surface, but generally only to professionals. Non-professionals can typically find and purchase solid surface through online marketplaces, such as eBay or Craigslist, as well as SolidSurface.com.
SolidSurface.com offers almost all brands as well as accessories needed to work with solid surface. We are one of the few places where currently stocked full sheets along with remnants of solid surface are available to anyone including the woodworker, cabinet maker, remodeler, fabricator, and DIY-er.