I also think Mistress Amrita is a bit too expensive and far away for most of us in Singapore. She will not think much of working from a hotel room either!
What about Hong Kong Mistresses
http://www.mistressayumi.com/
http://www.hongkongmistress.net/
or from Bangkok maybe Mistress Midori or some of her ladies
http://www.thaimistress.net/
or from the Philippines
http://www.goddessakira.com/
but if you really want a Japanese Mistress this lady would be my choice
http://mistress-rinko.kir.jp/