I bought a generic flex shaft rotary tool from amazon, for $60. I didn’t like the hand piece that came with it because the chuck fell off during use, it was press fit. So I bought a foredom 43t hand piece from ebay for $40. It has been perfect, 3 size collets, barely even gets warm. It all depends what you want to cut. I wanted the extra power for occasional aluminum. If you aren’t doing metal, just get the harbor freight faux dremel, I have one and it’s pretty nice.
I tried to find a link, I was sure it was the same as the harbor freight one.
Remember to lube the flex shaft with white lithium often.