i prefere not to count yet :-)
i bought the laser tube brand new second hand for 700€
(a guy who didn't have time to prototype, because making cnc for business).
and for the other parts, (laser included in the sum)
i'm at about 2100, because i prototype and learn too.
and i will have to add the laser controller board,
that i don't have bought yet,
because i still don't know which one to choose yet.
and the hardware is not yet finished.
i'm in the open source mouvement (fablab founder!),
but the open hardware is not yet good enouth for me.
maybe later i will go back to it if it will be better.
but nothing is perfect. cheap chinese board with *********ty software, but good result,
perfect open hardware, but not best laser exploitation.
or mach3 with your solution ^^
i don't know.