If you are on a tight budget for pre wedding shoot I think you may need to invest more time to search for things that are cheaper but not compromising on quality.
I think travelling to JB is tedious. Is it worth your while? The gowns are also old fashioned and poorer quality.
Consider a la carte. There are some bridal shops located in ulu location and hence can charge cheaper than Tanjong Pagar for similar things.
Ask friends to recommend photographers and MUA. Some just started and charge cheaper but they are skilful as well.
Good luck!