Servo motor for a robot arm

Hi all, i'm a new forumer My name is davide.
I maked a 3 node robot arm with sg995, it work but the servo are too weak.
Consider that is an artigianal arm i don't nedd precision but only POWER a Turnigy TGY-1270HV is a good option for the main node?
and Turnigy TGY-5521MDHV for the secondary arm and the rotation? (consider tha for rotation sg995 work perfectly)
I don't want to spent more than 30 $ for a single servo.

Consider that is an artigianal arm

A what?

a Turnigy TGY-1270HV is a good option for the main node?

Who knows? You didn't post a link to that thing, so we can't see how much torque it generates. You didn't post ANYTHING (correct) about your hardware, not even a picture, so we can't tell how much torque is needed.

I don't want to spent more than 30 $ for a single servo.

You may have to.

Sorry. I need a 35-40 kg cm for main node and 20-25 for other node. An artigianal robot it’s a robot made by me project, arms ecc.