Apple Watch 42mm Black Sport Loop  is retailing for S$78 in Singapore.
I bought mine from Apple Omotesando  in Tokyo, Japan, for JP¥5,800 (S$68), excluding tax.
I wanted to get it from Yodobashi as there is an additional 5% discount if you pay by VISA credit card. However, Yodobashi selection of Apple Watch straps is limited. I went to Yodobashi in Osaka, Kyoto, Kawasaki, Shinjuku, and Akihabara, and all of them do not carry the Black Sports Loop.
If you are using the Apple Watch for sports, I find that sport loops are better than sport bands . They are softer, more comfortable and most importantly more secure.