Typically, agents charge 2% for selling in Singapore. This can be negotiated down based on the price. If your unit is worth $1,000,000, then 1.5% is 15k, which is still good money, so many will take it. The higher the price, the lower you can push the %. You can contact the guys on Propseller to bring the commission down to as little as 1%. I hope it helps.