Cheap dab rig?

I want to start dabbing occasionally but everywhere I looked the dab rigs are expensive +$40.

I found a small one for $20 and was wondering if it is worth it and what difference the size makes and other factors to consider.

i like the small ones. i think they hit harder.
less diffusion the better.

the cheaper chineese ones work, but they are more likely to spit watter in yo mouth while using them in my experince..
the nice rigs I have been able to hit as hard as i can and wont spit in your mouth.