Do anyone have them? I want them in FLAC format, but mp3 is okay. I cant find them :c

Seems like most of them are available in mp3 here:

http://www.ost-center.com/ost/jeu-video/etrian-odyssey-4-legend-of-the-giant-god-sekaiju-no-meiq-4-denshou-no-kyoshin-ost-11555.html
http://www.ost-center.com/recherche/?q=yu-gi-oh

Some of the Yu-gi-oh OST's and singles are available in FLAC format (1Gb worth!) in the 2Tb Collection thread here

Thread 184713

Not sure if the ones you are after are included, but has to be worth a look :-D