Take a budget plane to Tokyo , get a 2-3 star hotel or even capsule hotel, go to Yoshiwara.
The damage is still worth it if you stay there for few days, if I remember right, the damage in Yoshiwara probably around:
70min 25k Yen , ~SG300
100min 33k Yen, ~SG400
130min 40k Yen, ~SG500
Though if you can't travel there then....
If you need advice on Yoshiwara you can message me, not really an expert yet but i can share my experience there.
Gl