^with all jpop I've seen so far, if there's an 'international version'(so chinese or korean usually) it will always be cheaper.
I haven't been able to find any H!P international versions so far myself, but if you're looking for cheaper try ebay. There's also a...smallish amount of other merchendise(like t-shirts and wristbands)
oh and quality-wise I'm pretty sure they're thr same, my friend bought a chinese ayu and all that was different was there was an insert with the songs in chinese.