I'm not sure they do "one piece" veneers, but the typical bookmatch (two-piece) ranges in price from $75 to $250. Most modern veneers are between 1/28" and 1/40" thick, so if we figure 1/32" then out of a block 1.75" thick (std guitar body slab) you could get as many as 56 sheets of veneer, less some for kerf and other losses. Call it 50 sheets. The tops involve more than the veneer itself; there's application and finishing labor and materials, but still. That's 50 guitars you can charge between $75 and $250 more for, so there'd be a gross sales dollar increase of $3,750 to $12,500.