Any other website to buy and send direct to Singapore ?
Yes there are plenty of online stores willing to serve Sporean customers. Have tested others but I use herb regularly.
Nothing beats www.iherb.com in terms of pricing & service because they drop ship to Spore. They also have special arrangements with SingPost to deliver to addresses in Spore. You can also track all shipments online.
They will also deliver within 1 week while other companies may take from 2 weeks to 60 days.