If you want small servos, just use steppers with drivers like TMC2130.
Anything bigger, many people seem to like ClearPath servos. Price to performance seem to be pretty good.
I believe he means servos as "high-speed DC brushless motors with feedback" not the low cost gearmotor servos used in R/C models.
but those aren't affordable! also you can buy steppers with feedback in NEMA34+ form factor for not too much. I use them in my machines.
It is about $1000 an axis for 1/2 hp AC servo + amplifier from China. But worth every penny. Some productive work can be done with bigger step motors. But setups with little ones are soon abandoned.