I'm currently a merchandising rep checking on displays and stock at BRUs, TRUs and local supermarkets. I mainly work T, W and Thr with an occasional special project on Friday's. I bring in about $300 a month. My schedule is pretty flexible as long as I get the work done on specified days.
I also used to post real estate directional signage. I started posting the signs at 4AM Saturday morning and then had to go back out Sunday evening to take them down. It was a no brainer job, but one I was able to do while my hubby was home with the kid's.
Now that my kid's are 3.4 and 5.5 I do have a block of 2.5 hours by myself three days a week.
Checkout your local Craigslist for local opps.
Now my sister and I own a little business. She makes bows (her business end is not little she sells hundreds of bows a month) My end is smaller though because I am in it for the extra money. I make hair clips and applique shirts. Just a few a month, but it is for extra fun money. You can also clean a house or two. Maybe family members or a close friend. My sister also does this once a week for extra money. My husband and I have a garage sale about once a month also when it is warmer. That is actually how I made all my spending money for Disney World this time. In the past I have sold on Ebay, but those seller fees will eat you up now. There are lots of things out there to do, you just kinda have to look and find them. 
