Hi Jun Kim,
If you don't mind, I tell you what I think:
1. Be aware that a Hendrix signature doesn't come cheap, so avoid so-called "bargains."
2. Don't trust private sellers and in case someone offers you something, always use this site for advices and/or opinions.
3. As you say, eBay is not a highly recommended site, as there are many forgers there. However there're also reliable sellers, as TrucksUk for example. You can also check the RACC list
I hope this will help.
All the Best.
Thank you for your advice. I want to buy PSA certified items, but there are many items that I can't trust. If you have a signature that is perfectly acceptable, please give me a link.
Also be aware that not all PSA authenticated Hendrix signatures are actually authentic.