This thread is going a little in circles estimating the cost of Shabbos.
I still find $70 to be a very reasonable cost, and obviously it could come out to less.
Just a point to add in - if you have leftovers for supper on Sunday night, you are saving on those suppers.
It is very hard to narrow down the exact cost of Shabbos, as there are often a lot of ingredients that will be left over from shabbos, like if you buy a Salad bag and have half left over, you will have salad for a different night available for supper.
I still would end up estimating the cost of food for a month to be $400-$500 which will include at least staying home for 2 Shabbosim.
Clothing.
Maternity clothing, Bsha Tova (really adds up).
Vacation.
Parking.
Home repairs.
Home items (from light bulbs and shabbos candles to toiletries to plastic dishes to Air conditioners to over the counter medication etc etc) THIS IS BIG.
What I can "Costco" (Paper towels/tissues/garbage bags etc)
Parking tickets.
Purim itself can be a few hundred (assuming all other YT is by parents and in laws).
Regarding most of above expense:
Clothing - are not needed for at least the first year married - given that you bough new cloths before marriage.
Home repairs - usually landlords expense
Parking/Parking tickets - not really applicable in Lakewood.
Home items - this is a good point to bring up. This should be around $200 a month.
Vacation - I do find this important
But that is what DDF is all about - and vacations with very minimal expenses should not be hard to plan.