I chanced upon this website where they sell used underwear, bra, etc. Sometimes there may also be honban offers. So far for the past few days I've been seeing honban going at 20k yen.
I paid 23.5k in total (3.5k for 2h love hotel) ～270sgd.
Unfortunately, it was the first time I'm pushing into a hole other than my hand, and I came too quickly. First she blew me, then guided me to insert in her.
One word of advice: please check whether they're attached or not. This lady was so heavily tattooed on her body, I kept worrying about yakuza bursting into the room and abducting me while I was screwing her.
Oh. And you'll need some basic Japanese level to email them, arranging place to meet etc.
http://oceanwind.jp/ibs/0312/