S.B.
It is probably easier to chop $100 or $200 out of your budget than it is to find a job working at home making that same amount. I work with people and their budgets everyday and it is interesting that most folks would rather work more than make cuts (nothing against your thinking, it just seems to be the first thought that comes into MOST peoples heads).
Here are the things that I mostly see people can cut (I don't know your life/budget, so these may not apply to you):
Stop buying coffee out
No more eating out
Pack lunches for work (and school) every day
Make your own laundry soap
Switch to cloth diapers at home
Plan your menu at home at least one week in advance and make a grocery list based only on those items
Turn your cable down one package/slow your internet down one notch/cancel home phone or bundle cell phones
Shop your car insurance around
If you have an infant/toddler, see if you qualify for WIC to help with formula/milk/cereal/etc
Call your utilities and ask about being on a budget plan (doesn't really save money, but helps plan expenses better)
Make your saving into a "challenge." You will be surprised just how much you can save!
I'm sure that other mom's have lots of ideas as well :) Good luck!