If we’re talking piercing fee only, not so bad. If that price is piercing with jewelry included I might have some concerns with the overall quality.
You do not need to pay a fortune to get pierced correctly, but I doubt an experienced professional could provide a piercing with an acceptable piece of jewelry for $ 20 total without some sort of sale or promotion.
Expect to pay a piercing fee of anywhere from $ 20-$ 50, with an average somewhere around $ 35, for an experienced body piercer. Now since you got earlobes keep in mind that some piercers may offer a slightly lower piercing fee to provide an affordable alternative to mall gun piercing.
Now on the jewelry side it will vary quite a bit with the style and material of the jewelry used. An inexpensive option like a steel captive bead ring may only cost $ 10-20. Internally threaded, or threadless posts will more likely start in the $ 20-30 range. And that is cost of basic jewelry alone.
In the future you can spend some time researching qualities of a high end piercing service with the APP’s educational brochures.