The quote I got from DMM came to about $2200, but that was in 2012.
That was for three 750W servos with DYN3 drives, all the required cables, and carriage to the UK.

What I will say though, is if you're upgrading a stepper system, the fact DMM do NEMA23/34 size motors, would make me consider those sizes to avoid having to rework brackets.