Harbor Freight has one for $48 currently - There are many 20% coupons online (Google "Harbor Freight 20% printable"). That will make the price < 40.
How good is this unit? Very good, if you follow a breaking in procedure: Soak the hand-piece in light oil for several days. I used oil plus kerosene with a post soak with just oil. Then also put some lithium grease in the shaft.
I just mentioned this here in case anyone does fine work, as an accompaniment to a Dremel (or in place of.)
One thing to be aware of with Chinese goods is they often come without lubrication, because it's messy to ship greased items.
The shaft is robust, as I have connected one of them to an electric drill for heavy duty drilling at high torque. No failures yet.