The price is around the market rate of those gynaes practising at private hospital. During 1st trimester, the gynae will schedule you to visit them once every 2 weeks. After 1st trimester, they will tell you to sign up maternity package, then the visits lengthen to once every month, and once every 2 weeks or weekly nearing your due date.
Do note that 1st consultation always cost more. Subsequent consultations will be less, around $60-$90. If it is out of your budget, i suggest you go to private gynae who practices at neighbourhood shophouses. They offers more competitive maternity package and they deliever at Thomson Medical Center, MT A or MT E etc.
I not going to suggest mine to you as my gynae is at Mt A and the charges is similar to yours.