Theres CDJapan too, right?
I cant remember if I bought Heart Station from YesAsia or CD Japan, but I remember being very happy with whoever it was.
This was after buying first Distance from Amazon, and getting pissed after it came with a crack in the case, and then mad after it took like, weeks for Heart Station/Stay Gold to come. So you won't find me buying from Amazon again. I honestly can't stand them.

Deep River I bought from a Japanese store in NYC(luckily I live close).
And I got First Love as a gift, but I'm not sure where they ordered it from. It's basically going to be expensive (Like 30$ or so) no matter where you get it, if its new.
Anyway, yeah. Lol just need Ultra Blue! (and TITO)

Edit: I'll also just share the one time when I went to a convention, and one of the booths selling stuff has her Ultra Blue(and given I'm missing it, I was excited). I asked the price, and the guy said it was 12$. Which was... incredibly surprising, and I figured it was too good to be true), and as soon as I looked at the back I could tell it was a bootleg :(