Why I prepare secondhand guitars.
Some people say that if you buy a secondhand guitar, it’s bad, because that guitar is skilled by former owner. But I think this difference could feel people, who are play guitar very well, like a good musicians, guitarists. So, it doesn’t influence so much for us, amateurs.

(http://www.mule.co.kr/)
However, dealing of used guitar can be dangerous. You should be careful! Nevertheless, if you want to try secondhand guitars, there are my short advices:
1. Find actual(real) price of guitar, which you want to buy.
2. Compare prices of new guitar and secondhand guitar on the market.
If you do that, you can buy a secondhand guitar in a good price.