If you have JP press / HK press CDs (not just Kana Nishino), you can compare it to them '__'a Just to mention, that bootleg reduced the quality of the print.
Sometime, they'll make it like legit, don't discover it by the barcode only.
About the CDs, you should see :
Made in Japan
- check the print quality, japan version is always clear on the words.
- check the PRICE, japan version NEW usually 30-50 USD here. And usually the bootleg will have super-tight sealed plastic outside. If it 2nd hand, meh... You already know the price, don't you think so? If all Japan version albums just 12,5USD like you mentioned, my room already full of CDs.
Made in Taiwan / Singapore / Hongkong
Same with I said, above. Just to mention, usually HK CD+DVD / CD only in this country will sell at about 170k - 260k IDR.
Price is what you'll get, dude
Anyway, my friend ever find alan's My Life on Sangaji music, Senayan City :p