[Top 3] List order (cheapest -> cheaper -> cheap) for TOP 3 brokerages for SG shares.?

For CDP:

• DBS Vickers for buying (0.12% min $10)

• FSMOne for selling (0.08% min $10)

For custodian:

• Interactive Brokers (0.08% min $2.50)

• Tiger Brokers (0.08% min $2.88) - minimum waived till 31 Dec 2020

• FSMOne (0.08% min $10)

Do note that Interactive Brokers has a 10 USD minimum monthly commission. If you are making very few trades and infrequently, you should consider the other options listed.