ATLUS released today the FULL Etrian Odyssey Soundtrack and Sound Pack music collection on the Japan Amazon. The package until August 23 available in special prices / music collection which means instead of 1800 Yen you can buy one sound collection for 900 Yen (with tax) and instead of 1500 Yen you can get it for 390 Yen (with tax).
This digital packages released for the Etrian Odyssey II and Etrian Odyssey III and the Etrian Odyssey IV and you can buy them one by one or in dual package. Until August 23 by the way you can choose 2 songs what you can download for FREE!
The collection can be found in here: https://www.amazon.co.jp/sekaiju