Based on this list
[1], the best site that offer Serbian VPS is
2sync.
You can find more sites using this list
[2].
I have not used any of the sites above, so I can’t guarantee that they are trusted (you should search before conducting any transaction.)
The site above is the best because they accept PayPal payment so they are unlikely to be scammers.
You should be careful when dealing with Bitcointalk members, especially from low-ranking members on this section.
[1]
http://cryto.net/~joepie91/bitcoinvps.html[2]
https://offshorevps.org/country/serbia/