>> There are only around 250 of them
http://www.vintage.org/content.php?id=a02
Only 200 Apple-1's were ever sold, and fewer still exist today.
"Most Apple-1 owners took advantage of a two-for-one deal offered
by Apple when they came out with their then new Apple ][ computer",
reports Ismail. "They traded in two Apple-1 computers for a new
Apple ][. All but one of the Apple-1's that were turned in to Apple
were destroyed." Ismail estimates that fewer than 50 examples of
the Apple-1 exist today.